I third Love Actually.
Yes, Yes, haven’t seen it, and Yes. (Paul Bettany – yum.)
Am looking forward to the upcoming Drew Barrymore-Hugh Grant one about songwriters – please god, let it not suck.
Agree with Campion on the relative merits of the original Doris-and-Rock films vs. the pale imitation that was Down with Love.
Loved LA Story, Shakespeare in Love, About a Boy.
Eternal Sunshine was already in my Netflix queue – several others of these will be added. (Creator looks … interesting. I adore Peter O’Toole, though. Big Eden … hm, be prepared to be beaten about the head and shoulders the next time I see you if I don’t like it, SVF!)
Keep 'em coming, gang…
I won’t repeat ones already mentioned.
I will add:
Bridget Jones’ Diary
and the sequel to the list.
The original was superior. Hugh Grant was very caddish, and Colin Firth very Darcy-ish, and the fight scene was hilarious.
Okay, I thought of some more:
Miss Congeniality - Sandra Bullock was cute, Benjamin Bratt cuter, and Candice Bergen a scream
While You Were Sleeping - Sandra Bullock again - sweet, not the best of the bunch, but not awful
When Harry Met Sally - which I assume everyone has already seen, but just in case
Sleepless in Seattle - ditto (and I would **not ** recommend the other Tom Hanks/Meg Ryan movie, the one about the bookstores, the end of which annoyed me)
13 Going on 30 - liked both Jennifer Garner and Mark Ruffalo - and as someone pointed out on another thread today there was also Andy Serkis dancing to Thriller
French Kiss - Meg Ryan and Kevin Kline. Worth seeing for Kevin Kline alone.
Just Like Heaven - Reese Witherspoon and Mark Ruffalo - mostly for Mark Ruffalo though the Napoleon Dynamite kid and an actor name Donal Logue had good supporting roles.
Okay, I’m done now.
(Can’t restrain myself from saying: I really like Groundhog Day!)
I never thought of them this way before, but most of Cameron Crowe’s films have romantic comedy themes:
Fast Times at Ridgemont High
Say Anything
Singles
Jerry McGuire
Almost Famous
I’ve always been a big fan of Only the Lonely with John Candy.
Another mention for Keeping the Faith and Garden State. I also really enjoyed My Big Fat Greek Wedding which tops my list of movies to watch when I need a pick-me-up.
Second Love Actually and Garden State. WRT Bridget Jones, you may want to give the books a try before the movie.
My own contribution: Bride and Prejudice. What could be more comedially romantic than a Jane Austen Bollywood musical?
I’ll pitch in and recommend “The Closer You Get” which you’ll need some skill at deciphering Irish accents to get, but which is funny and sweet but not all that saccharine.
Forget Paris
I wasn’t expecting much at all when I first saw this years ago, but I highly recommend Return To Me.
For something a little bit different, I’d definitely recommend Imagine Me & You (Imagine Me & You (2005) - IMDb. It’s a romantic comedy – with lesbians! Funny and cute.
I like Hope Davis a lot, so I’m a big fan of Mumford. Jason Lee plays the quirky friend.
Adam Sandler pretty much only makes romantic comedies, and they vary greatly in quality. His best efforts (by far) pair him with Drew Barrymore; The Wedding Singer and 50 First Dates are probably my all-time favorite romantic comedies. For non-Barrymore Sandler flicks, Big Daddy is the best of the rest.
Mark Ruffalo doesn’t do many romantic comedies, and the few he does most definitely carry the risk of diabetic coma, but damn if he isn’t superb at it. Thus, 13 Going On 30 and Just Like Heaven are easy to recommend. Speaking of Just Like Heaven, Reese Witherspoon shines in this genre, so in addition to seconding Sweet Home Alabama, check out Overnight Delivery. Fair warning: that last one pairs her with Paul Rudd (from 40YOV), who some people can’t stand. If you don’t mind him, be sure to check out Clueless.
I see some same-sex romantic comedies have been mentioned. If you’re into that kind of thing, Jeffrey and Kissing Jessica Stein cover both genders.
• Barbra Streisand and Ryan O’Neal in What’s Up, Doc?.
• Jane Fonda and Robert Redford in Barefoot in the Park.
• Clark Gable and Claudette Colbert in It Happened One Night.
• Cary Grant, Katharine Hepburn, and James Stewart in The Philadelphia Story.
• Richard Dreyfuss and Marsha Mason in The Goodbye Girl.
• Ruth Gordon and Bud Cort in Harold and Maude.
• Mary Pickford and Charles “Buddy” Rogers in My Best Girl.
• Greta Garbo and Melvyn Douglas in Ninotchka.
• Gregory Peck and Audrey Hepburn in Roman Holiday.
• Margaret Sullavan and James Stewart in The Shop Around the Corner.
• Cher and Nicolas Cage in Moonstruck.
• Barbara Stanwyck and Fred MacMurray in Double Indemnity.
• Walloon was just seeing If You Were Awake.
• Jean Arthur, Joel McCrea, and Charles Coburn in The More the Merrier.
• Marilyn Monroe and Tom Ewell in The Seven Year Itch.
• Sophia Loren and Marcello Mastroianni in Yesterday, Today and Tomorrow.
• Audrey Hepburn and Rex Harrison in My Fair Lady.
• Woody Allen and Diane Keaton in Sleeper.
• Shirley Booth, Anthony Perkins, Shirley MacLaine, and Paul Ford in The Matchmaker.
• Shirley MacLaine and Michael Caine in Gambit.
• Laurence Olivier and Katharine Hepburn in Love Among the Ruins.
• Michael Caine and Julie Walters in Educating Rita.
Walloon – I don’t think you can stretch the definition of “romantic comedy” to include Double Indemnity, classic though it is.
After I went offline last night, I was, however, thinking of some classics – I’ll nominate Barbara Stanwyck (one of my all-time faves) for Ball of Fire and Christmas in Connecticut.
(And kawaiitentaclebeast – abso-freakin’-lutely on Bride and Prejudice – of all the movies mentioned so far, it’s the only one I own.)
I’ll second it. (As a film, it rates about 6 decapuppies on the “cute/sweet” meter. That’s the Imperial-style measurment, mind you.) And PastAllReason’s suggestions, whch are basically the Old Testament of romantic comedies, I think.
As for myself, I’d like to reccomend Addicted to Love. It could be considered “dark,” as romantic comedies go. I hate to give details away at the risk of spoiling the plot—but jilted lovers and obsessive revenge schemes figure in big. It introduced “skullzes” into the vocabulary around my house (for good or bad)—you’ll get it when you hear it.
Perhaps you read the line immediately following that? 
The Girl in the Cafe (another Richard Curtis movie – writer of 4 Weddings, Notting Hill, Love Actually)
His Girl Friday – absolute genius
Some Like It Hot
Bringing Up Baby
Flirting with Disaster
Amelie