I don't know if any of you have used this, but it has been a lifesaver of sorts for me.  I ran out of minutes this month because I had to spend a lot of time talking to Hyundai about our car which was basically ruined a few weeks ago.  Because I don't want to pay $.40/minute until my minutes are renewed, I tried to find online how you can make calls for free over the internet (didn't want to use Skype), and I found a few services but they had weird restrictions (five minute talk time, etc.).  Then I stumbled across the phone feature in Gmail, which allows you to make calls right from the Gmail interface.  If you also use Google Voice, it makes the whole thing even better.  It is very clear, and very convenient.  So if you have a Gmail account and want to make a call directly from your computer, just call from there.