Skype, the incredibly user friendly VOIP client, just added video capabilities to it's software package. Skype is one of the best internet apps out there because, besides looking good and being intuitive, as many have said before: it just plain works. The sound quality is great, and stands up flawlessly when compared to a regular POTS system. Sticking it to the phone company is always nice, too.
If you've not already wired up your pre-existing POTS system to your VOIP system, you may be interested in this DIY project that walks you through the creation of a telephone-to-VOIP adapter for your wired or cordless phones. From the site:
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