Forward calls to PC

Sorry no in 2006 skype offered free calls in north america and canada.

Now it's $30 a year

Raketu is free but there are certain countries that it charges for. They charge you $9.95 as a startup credit in case you call anywhere not in the 42 country listing but you can't yet register a number for people to call you.

VoipCheap is free as long you don't break 300 minutes a week to the same IP. After that they nail you.

well here's a breakdown site figure out how you want to play it

http://www.voipnow.org/2007/04/want_free_voip_.html