The 20+ independent coffee shops with ample seating and free wifi. E-mail me (website in profile info) and I can show you around if you'll still be here. Tell Eric A. I said hi.
Ehh, the only actual good coffee in Berkeley is Philz. Oh, and Mokka, but that's far from campus. Oh yeah, and Local 123, but that's even further from campus and overpriced. Guerilla should in theory have good coffee but their service is kinda rude. Brewed Awakenings, where you're most likely to run into mathematicians, has awful coffee. Sonoma is alright. And... that's all I can think of, off the top of my head.
I worry these coffee shops might be getting oversold here, though. If you do run into a mathematician he'll be too busy thinking about mathematics to talk to you. :)
