Google's slowly opening GrandCentral to new subscribers:
Blogger Buzz: GrandCentral: receive calls and post voicemail with your blogAnyone with a Gmail account can get a Google blog in an instant, so the service is now open for new customers.
...With GrandCentral, a free service from Google, you can receive phone calls and post voicemails right on your blog. Though GrandCentral is currently in a private beta test, bloggers can skip the wait and get a free account immediately...
I'll have to see if they've done anything to make it work for me. I expect the kids will get GrandCentral numbers eventually.