I have to agree and say that skype is my favorite voip of choice.. I also have the unlimited plan and skype in.. (currently live in dubai).. for 5-7 a month.. i can receive/make calls and never watch the minutes.. and the international rates are decent (when i need them)

another great thing is that i have the fring app on my ipod touch 2nd gen.. which means i can access my skype and chat/make or receive calls anywhere i have a wifi connection.. perfect for those times at the airport!

having a notebook with bluetooth is great also.. i usually connect while walking around my room/office at home..