Skype has become the de facto standard for VoIP calls and started out voice only but in recent versions has grown to include video calls. Largely free, Skype with a web cam can provide decent quality video calls but another free program (basic version) is growing in popularity by allowing very high quality video calls that easily outshine Skype. SightSpeed 5.0 is a beta program but PC Magazine found it a decent alternative to Skype due to the superior video coupled with tight audio synchronization. Check out the program web site for all the details.

-jk
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