In case you didn't know this was a series of posts, now that they're all running, here are links to all three of them.
#1 - Analyzing VoIP's basics reveals telephony's evolution
#2 - Three use cases that highlight the benefits of VoIP
#3 - What you need to consider before you buy VoIP
As always, comments are welcome, and any sharing you can do with your colleagues or customers would be greatly appreciated!