His Beardly Weirdness' Guide to Beijing WiFi Cafes, for losers:
Finding a place to plug in your laptop can be as much of a pain, and for that reason I strongly suggest you stay away from the Starbucks in the Village at Sanlitun, as it's got very limited seating. It's very busy.
S.I.T. burns coffee. However, they will never kick you out or compel you to order something for taking up a seat.
Wudaokou does not deserve the Bridge. Thanks to that place, Illy coffee has become the standard by which I judge all coffee. It's like that one time you jacked off on ecstasy. It'll never quite be that good ever again. Consequences will never be the same.
In the Nanluoguxiang area, Xiao Xin's cafe is just okay. I haven't been in there so much this summer. I'm sure there are better options.
I don't think any of these places are ideal for getting work done, however. Yes. This is just occurring to me now, because I'm a bum. But anyway. Getting work done is not what coffee or cafes are for in China. They are for preening in front of your MacBook
and pretending you're writing something of consequence, or meeting a Chinese girl who will fuck you on the first date but is too traditional for beer and cigarettes.