k7.net, run by the IPKall folks, lets you use their "unified messaging" for free--you can set it to voicemail/faxmail or fax, with a personal greeting, default message, or fax tone. »www.k7.net/
That's probably what I'll do since we have free long distance w/ AT&T. I just liked that google will transcribe the messages. (although that's not a deal breaker, just a plus)