Well, I finally took the plunge into the murky underworld of VoIP. 
Got the hardware, now I need a decent SIP compliant provider. I'm going to use it mostly for calls to US telco numbers, so cheap US calls is a must. I would like to be able to be called from landlines too, but that's not the highest priority.
Suggestions?

Got the hardware, now I need a decent SIP compliant provider. I'm going to use it mostly for calls to US telco numbers, so cheap US calls is a must. I would like to be able to be called from landlines too, but that's not the highest priority.
Suggestions?
