I ALSO found a great list of why Elizabeth and Jack should be together written by a few fans of POTC 2. I am all for Will and Lizz, but they make some REALLY good points right here!!!
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Reasons why Elizabeth Swann and Jack Sparrow should be together:
1. They have freakin awesome chemistry!
2. She taught him the "pirate's life for me" song on the island
3. Because Elizabeth was the first one who wanted to come to Jack's rescue. ("What about Jack, are you just going to leave him?")
4. Elizabeth is more outgoing, like Jack. Go together good.
5. Elizabeth is more scared of Norrington's proposal than she is of being taken hostage by Jack!
6. He saved her life, many times!
7. Even though he says it would've never worked out, we know better!
8. Will is too boring for Elizabeth, Jack's more exciting.
9. Because he was the first man to come to her rescue
10. Because only he recognized that she couldn't breathe with her corset on.
11. Because they saved each others lives so they're square.
12. Because they had an exciting campfire romp.
13. Elizabeth had to convince Will to call her by her first name for years before he actually did it (in hearing distance of anyone, that is). Jack, however, called her Elizabeth right away.
14. If it weren't for Jack, how would Will have managed to save Elizabeth's life?
15. Because Elizabeth is "daft like Jack".
16. Because Jack saved her from drowning...with excellent diving form I must say.
17. Dude. Look at their last names. Swan? Sparrow? Both birds, it's a sign.
18. Because she's secretly fascinated by pirates and she knows it.
19. Because someday, it will work between them.
20. Because he knows exactly what she means.
21. Because she’ll go easy on his goods.

...
22. Because someday, she’ll have had enough rum for that sort of talk.
23. Because being with her was “infinitely better” than being alone on the island.
24. Because he’s Captain Jack Sparrow. Savvy?
25. Because Elizabeth doesn't mind drinking rum with Jack. (if you saw the second deleted island scene, you would've observed that she actually drank quite a bit)
26. Because Jack referred to Elizabeth as a treasure. ("Not all treasure is silver and gold, mate")
27. Because in the original screenplay, Elizabeth gave Jack a kiss!
28. Elizabeth thought it was wrong to hang Jack.
29. Elizabeth was the ONLY one who Jack told the REAL island story too.
30. Because they’re peas in a pod.
31. Because she called him her "rescuer."
32. Because the way he had her putting his belongings back on him was enough to make you blush.
33. Because they were stranded on an island together.
34. Because when they got drunk, they were hilarious.
35. Because they're be no living with her after that.
36. Because she got rid of all his rum, and he wanted to know why.
37. Because they are the "Rum Runners."
38. Because they love singing the pirate's song together.
39. Because she stood between him and the army ready to take him away.
40. Because of the look he gave when he heard she'd be imprisoned.
41. Because when he saw her again, he had his men hide all the rum.
42. Because he didn't think those clothes suited her, and had "no" dress for her.
43. Because she trusted him.
44. Because of the smile on her face when she was thinking of him.
45. Because he asked her to persuade him...and then he asked her to again.
46. Because she can hold her own against him.
47. Because they can talk about freedom, which is exactly what they find in each other.
48. Because she ended up doing exactly what he told her she would.
49. Because he ended up doing exactly what she told him he would.
50. Because they're very similar.
51. Because what they shared was far more than mere curiosity.
52. Because they're chemistry is friggin' undeniable, savvy?
53. Because he let her know his compass did work.
54. Because whenever she held his compass (which showed you what you wanted most in the world), it would always point to him.
55. Because they both wanted a taste...of each other.
56. Because they flirt.
57. Because she knew he was a good man.
58. Because she didn't hesitate to mention he was Captain Jack Sparrow.
59. Because pull up a cup of Rum (their official drink), and grab a bag of Sweetarts (their official candy), and watch the magic happen.
60. Because they shared the hottest kiss ever!
61. Because he called her a pirate.
62. Because of the way she said, “Oh, Jack” at Tortuga
63. Because Norrington said himself that there was a time when he would give anything to have her look at him like she looked at Jack.
64. Because she tells her father that Jack’s “more of a man than you give him credit for.”
65. Because she makes sure that Beckett calls him “CAPTAIN” Jack Sparrow.
66. Because he has an intuitive sense of the female.
67. Because he’s Captain of a ship, and he can form a marry-age on his ship; on that deck.
68. Because she has faith in him.
69. Because she’s proud of him.
70.Because she ALWAYS known that he’s a good man.
71. Because she’s happy that he came back.
72. Because she clung to his leg for life when he returned.
73. Because she would do anything to bring Captain Jack back.(ME TOO)
74. Because in the rescuing scene he calls her "MY LADY"
75. Because he touched her in places Will never did (while pulling her out of water)

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76. Because none of her kisses were ever so long or passionate.
77. Because they are both curious
78. Because he has no dress in his cabin.
79. Because the compass never lies.
80. Because she's not sorry
81. Because she cries for him
82. Because she's a pirate's wench.(quoting Keira)
83. Because she knows a lot about him(you robbed blah blah without firing a shot blah)
84. Because acording to the code she must be taken to the captain.
85. Because she spent some quality time with him wearing what was then considered underwear.
86. Because Jack proposed to her (in front of US!!)
List credited to some lovely ladies at FREEDOM The first Elizabeth Swann and Jack Sparrow fan site.