Thanks to everyone who responded on my iSight question. I'll have to post the results once I get the system working.

On another note, what is a good mobile phone service to use? I'm going to be based in Chicago but will be travelling frequently to NY, SF and DFW. My employer does not look too kindly on personal calls on the company phone so I need to get one for myself. One other point, I want favourable rates to call friends and family in Canada.

Any pointers?