Exactly HOW LONG has it been since you last talked to her??
This is one of those things that, if you're going to do it, you need to do it RIGHT AWAY and be DIRECT about it. Send her an E-mail the following DAY and be like, "Hey, I didn't catch your name/contact info after class yesterday when we talked, but you seemed like you might be an interesting girl to get to know better. Maybe we could get some coffee this weekend. Send me your number and I'll call you. -Skinny"
If you look up her info RIGHT AWAY while you're fresh in each other's minds, then it's STILL a little suspect because you didn't get the info from her, but at least it's almost like a continuation of the convo you had earlier...you just forgot to get her number at the time and you wanted to grab it before it was too late. Act casual with it, but be direct. Suggest something right off the bat and be aggressive.
If you sit for two or three weeks and THEN look up her E-mail address in some registry, then it's CREEPY AS HELL. It means you HAVEN'T seen her in some time, she probably doesn't even remember you, but it says that you've been sitting there THINKING about her for all this time, even though you haven't seen her and she's most likely forgotten you, and now you're trying to obtain personal info from phone books and sh!t. *shudder*
On TOP of that, you're kind of hemming and hawing about it. "Uhh...this is Skinnydart...uhh...from the class, remember. We, uh, talked once. Maybe we can, um, like, hang out...sometime....let me know. I'll be...waiting. Yeah. Bye."
BOTTOM LINE: If it's only been a day or two, then send her an E-mail straight away and be DIRECT about it...she's gonna want to know WHO 'tf you are and WHAT 'tf you want. If it's been much longer with that, sorry to say it, but your best bet is to run into her in person (college is a "small world", it could happen next semester) and talk to her then. You can send an E-mail if you want, but expect her to get creeped out and not answer/not want to talk to you any more. And if you do send something, either way, GET TO THE POINT.
And if there's one thing you should take from this, it's this:
Originally posted by diablo
You missed your chance. Actually, 3 chances a week. For an entire semester.
Too many of these damned threads with this last-call syndrome going on. "OMG there's this hottie in my class, we talked a few times, but now class is over and I have to ask her out NOW or I'll never see her again! OMFG whatamagonnado???"
Should have already done something. Stop waiting for something to FORCE you to action and start taking some goddam initiative. You're in college now.