According to this article: http://www.hercampus.com/life/entertainment/30-best-chick-flicks-all-time
The 30 best chick flicks of all time are:
1. The Notebook
2. Clueless
3. Mean Girls
4. Romy & Michele's High School Reunion
5. 10 Things I Hate About You
6. Miss Congeniality
7. Sweet Home Alabama
8. The Lucky One
9. The Holiday
10. Valentine's Day
11. No Strings Attached
12. Friends with Benefits
13. The Parent Trap
14. How to Lose a Guy in 10 Days
15. Sex and the City
16. 27 Dresses
17. (they skipped it)
18. A Walk to Remember
19. Crazy, Stupid Love
20. He's Just Not that Into You
21. When Harry Met Sally
22. The Ugly Truth
23. Breakfast at Tiffany's
24. Sixteen Candles
25. Sleepless in Seattle
26. Dirty Dancing
27. Bridesmaids
28. Pretty Woman
29. Titanic
30. Legally Blonde

Thoughts on this list? They missed Love Actually - that's my favorite chick flick!