If you're stuck on Mill and you want some coffee really bad, they've got some really bad coffee for you. Honestly, Coffee Plantation isn't on my top 20 best cups of coffee, but it's one of only a few places where you can get a latte near campus. It's not very cheap and the barista range from friendly to hipper-than-thou art school drop outs. Nonetheless, it is a coffee shop, they do make espresso drinks, and there is some good people watching to be had.
WiFi's free- you can pay to use their computers if you're technologically disadvantaged though.