On a related/feminist note... part of the problem these days seems to be that films are written for demographics rather than people. If I never heard the phrase 'chick flick' again, it would be too soon. I find it to be one of the most irritating and degrading phrases in the English language. Same goes for 'chick lit'. You don't have 'feller films', or 'bloke books'. You have 'proper films', and then you have films which have been written, produced and directed (on the whole) by men to try and make money by pandering to what they think women are interested in. I am a woman. I am not interested in weddings, shoes, handbags or children, thanks very much. (That said, I think the original 'Sex and the City' series is wonderful but not because the women talk about shoes - pretty much every episode of that show is Bechdel-friendly and it covered topics I have never seen discussed elsewhere in film or TV.)
My favourite 'feel-good' films (by which I mean films I turn to when I am feeling glum because they are guaranteed to put a smile back on my face) would be:
'Aliens': What's not to love? Sets the bar for the action-movie group dynamic (very rarely equalled since). Kick ass female lead, sparks of romance (Ripley/Hicks), blood, guts, laughs and some of the most quotable dialogue in history. You can't not watch this and come away feeling good.
'2 Days in Paris': I must have watched this film 10+ times, and I still laugh like a drain every time. Even better is when the credits roll and you realise Julie Delpy's name is on just about every screen. She is my absolute hero. I wish there were more Julie Delpys in the world.
'Hellboy II': Words cannot express my love for this film. Every time I watch it, there's something new to love. Del Toro = amazeballs.
'Legally Blonde': We're into serious glum-territory if I have to rake this one out, but it usually does the trick. Bimboid goes to Harvard, realises there's more to life than chasing guys. Win.
'The Wedding Singer': The *other* good Adam Sandler film (aside from Punch Drunk Love). Cheesy, but always makes me grin.
By the way, there are quite a few of us on Twitter in a Black Squadron offshoot entitled TwitSquadron for anyone who is Twitter-inclined and wants to chitter away about A&J nonsense. Drop me a tweet (I'm @wickwox) and I'll add you to the list.