Ordinarily people would pay big bucks for a technology industry analysis paper but what the hey, I'm in a good mood so you get it for free:
Skype:
Pro: It's really easy to set up. Cons: Requires using a PC and headset, or gizmos to connect a phone directly to a PC Doesn't interconnect with anyone else, so you have to pay Skype rates No way to receive incoming calls from non-Skype users
FWD etc:
Con: Harder to get going Pros: You can use almost any equipment You can, in various ways, connect with almost anyone (except Skype) You can really do anything you can imagine as long as you have the time to work it out You can shop around for the best rates for termination.
miguel