Read what NYT says :
YouMail, also in beta testing, is also dissatisfied with traditional voice mail. Its solution, though, is a complete surgical replacement of your carrier’s voice mail system. When you sign up at youmail.com, you’re instructed to reprogram your cellphone by typing in a series of codes. When it’s over, YouMail is your voice-mail service — not your cell carrier.
Why bother? First, because you can record a separate greeting for everyone you know. Your boss will hear you say: “This is Casey Robin, systems manager at Globodyne Technology. I’ll get back to you promptly. After all — your business is our business.”
Your love interest, however, will hear: “Hey there, huggalump. Miss you. Leave me a massage.”
(Hint: Don’t mix them up.)
You can even treat certain callers to something called Ditchmail. That’s when they hear, “This user is currently not accepting new messages. Goodbye!” (Disgruntled exes come to mind.)
For everyone else, you just record a generic greeting. You can also check your messages from the Web or any phone, save memorable ones to your computer, and forward messages to other people.
Sounds promising ! Unfortunately, only for US consumers at the moment.
The service is free for the beta launch, but will be ad-suported from next year or with a fee if if don’t want ads
Who wants to build a non-american version of the service ?