[dvdmon]

I'm surprised no one has mentioned Grandcentral.com, a company that was bought by Google last year. It won't work in the same way as these services, but basically you get a "number for life" at a huge array of area codes (I got my local one) for free, then you just give out that one number vs. your home number, your cell number your work number, etc. It will forward to multiple lines AT THE SAME TIME. So if you are at your home or work and have them set up as well, you can opt to pick up a landline instead of the cell. You can retrieve voicemail via a web browser, so just use the one on your phone. The execution isn't always perfect which is why I've not given everyone my number, just a few. Unfortunately after Google bought them, there hasn't been much of anything in the way of news, new features, etc., but it still works and it doesn't look like it's going away...