I walked into my second day of calculus with a flyer/sign up sheet for "Math 191 Study Group" - and, the next thing I knew, I had every damn phone number and email in the entire class. After a few study sessions, I was already getting calls mid-week from girls who were really had nothing to ask me, but were trying to sound like they did. Ahh, life was good.
Start a study group in your class. It's great for meeting, attracting, and getting to know. If you do this, study hard before the meetings and have a plan/some rules, so that it's clear that your the leader. Chicks dig a man who people listen to.
You don't have to start a study group to get noticed, but you always have a better chance with a girl if she's seen you before you've noticed her. I tend to make a lot of friends in my classes and just before/after my classes. I'll flit with all the girls, and even if they don't end up going out with me I'll be seen chatting with them, and that's always a good thing. Also, if I show up for a class and the teacher's gone, sometimes I'll address the entire class with a question I have ("Did anybody get #12 on the homework? I thought it was impossible... but I got all the others!"). I've met girls a few times that way, when they responded with something like "Yeah, but did you get 13?" So you trade answers, change the subject to something else (preferably shared interests, say for example snowboarding) and tell her something along the lines of "Damn, we're both smart on our own rights, but toghether - we're unstoppable. I'd bet we'd be great snowboarding together too! Here, write down your phone number for me" This one works like gold.
Girls are incredibly easy to meet on campus, at least during the day (girls can be tense and distrusting at night if you're approaching alone). You should feel like a kid in a candy store on campus, and approach girls shamelessly. Especially at the beginning of the semester, when many people don't know a lot of people or have their social circles intact. This is the time that social proof is the most powerful - if you know people, they're going to want to know you. You know the secret to knowing people is just making an effort to meet them. So talk to everyone and get yourself a place reserved on that August bash guest list.