When you are looking from some good internet statistics The Pew Internet & American Life Project can help. Anything from who is online to which ones are using VoIP.

The Pew Internet & American Life Project is headed by Madeleine Korbel Albright, former Secretary of State... ok maybe that should be left well enough alone. In any event, it is a great site aside from it's new CSS which sucks and is a good example of how CSS is difficult to use across multiple platforms and browsers. Site looks great in NS6+ and Firefox but is quite lame in IE. I am very taken back that an organization that has the statistics of more than 85% of Internet users are on IE broswers and why they would disenfranchise those users for design :(

Check out their reports. I have not found one that they are charging for yet and they are good ammo for any statistical battle you might get yourself into.