http://www.sixi.ch
http://www.sandraschmid.com

The people at those two firms were both very friendly and verbose when I was looking for employment, very honest and direct as well. I'd try them.

http://www.mrd.ch

This lady focuses mostly on Zug jobs, but she gives excellent advice and has a really good eye for picking out opportunities that are well-suited to you.

And of course, if you're looking for jobs in the telecom industry as mentioned, I work at the 7th largest telecom in Switzerland, www.tic.ch, at least until the end of the month. Not in Zurich, unfortunately, but you can check the open positions if you don't mind working half an hour south of Zurich. If you apply, tell them you heard about it through me. ;-)

Cheers,
Lance