google voice
i see it on my gmail tonight for the first time. seems easy enough. they give you a $0.10 credit to start. all calls to the us and canada are free. calls to spain are $0.02, so i can talk for 5 minutes with my credit: 
took a quick screen shot. had to install the voice plugin. when chrome restarted it had trouble coming back up, had to wait for an unusual long time, probably got caught in a loop, but finally opened up working fine.
