I'm no longer at Berkeley, but I'm sure there are any number of professors or grad students who'd be happy to talk to you. I'd talk to Armando Fox if you want to get into research, he works with a lot of undergrads. He also runs a website (Research Match? something like that) which lists projects looking for undergraduates.

The CSGSA also hosts an undergraduate "research mixer" which is a chill way of speed dating a bunch of projects.