Ok, first off, loving this thread!
Ok, my fav. movie kisses are:
Sam/Josie- Never Been Kissed- the most romantic kiss ever, I loved the build up to it so much!
Thomas J/Veda- My Girl- the cutest kiss in cinematic history, it gives me goosepimples b/c of how adorable it is!
Mark/Juliet- Love Actually- such a sweet kiss ever!
Guy/Faye- That Thing You Do!- I just love the whole "When was the last time you were decently kissed? I mean, truly, truly, good and kissed.", & then he kisses her, omg, it's the best!
A.J./Grace- Armageddon- I loved every single one of their kisses, they are by far one of my fav. movie couples, they were just so sensual!
Preston/Amanda- Can't Hardly Wait- I loved their ending kiss, it was just so hot & so great!
Henry/Lucy- 50 First Dates- granted all their "First Kisses" were sweet, I particularly adored their kiss in the rain (of course, lol), it was the best one! The whole "Can I have one last, first kiss?", was so bittersweet!
Sebastian/Annette- Cruel Intentions- the one where he kisses her at the top of the escalator is my fav! The whole, "I'm impressed." "Well, I'm in love." thing, gets me everytime!
Peter/Wendy- Peter Pan ('03)- omg, their kiss was so sensual for being so young, it gave me shivers! I loved it!
Austin/Sam- A Cinderella Story- I adore kisses in the rain, & since it was a longer one than most, I had to have it on my list. I love the slow-motion falling of the rain, so romantic!
Matthew/Danielle- The Girl Next Door- their first kiss when he just goes to her & turns her around & kisses her, true romance!
Jake/Melanie- Sweet Home Alabama- their ending rain kiss was so romantic!
Noah/Allie- The Notebook- ok, I adore kisses in the rain, but since they didn't stay too long on it, it's not #1 on my list, but I still love it!
Romeo/Juliet- Romeo + Juliet ('96)- their first kiss in the elevator & then their kisses in the pool, by far the sexiest kisses ever!
...ok, I think that's it, there's probably more, but that's all I can remember.