I basically agree with everything Mike said, and I'm really excited about the directions that next year's co-presidents will take the group. I'm not really checking LSD much anymore (I started work this week), but feel free to send me an email if you have any specific questions or want to hear personal anecdotes.
Congrats on Harvard, Ersatz! Absy (and, to some extent, lyquidmyrrrh) are probably more qualified to talk about the LGBT atmosphere at Harvard, but I'll throw in my two cents. Harvard seems to be a pretty great place to be gay. I brought my bf to the admit weekend, and didn't feel awkward at all. One of the faculty-guided discussions addressed the constitutionality of gay marriage and domestic partnership benefits, and the whole crowd seemed really progressive and pro-gay rights. The Lambda Law group seems to have a pretty strong presence on campus, and they have a pretty large membership. And, of course, Boston/Cambridge is a pretty gay-friendly city. It's not quite as gay at the SF Bay Area, but close.
Good luck on your decision!
Thanks, Mike - I'm definitely glad to hear you say that. Appreciate your response! Absy / lyquidmyrrh, if you guys are around, I'd love to hear from you as well.