Maybe you all have already seen this but there's a site
www.privatephone.com which is run by Netzero. You sign up, and instantly get a phone number people can call into and leave voicemail. You check the voicemail by phone or via the web. I got it working in under 3 minutes. I have no idea how they plan to make money off it, but it seems to work nicely. (Didn't hear any ads on the voicemail greeting or anything like that).
I'm switching my website support phone number to this (was paying $15/month to Vonage), as well as my phone number on my Domain Registrar information (since using fakes on those are a real bad idea).
Anyhow, thought I'd share.