From the same site that has been comparing these articles since before the PS3 launched (with the help of a multi-platform game developer) comes the latest article in their XBOX 360 vs. Playstation 3 series.
This article objectively compares the two consoles, and considers all the changes that have taken place during 2008. This includes new interfaces, better multi-platform support, a look at the quality of exclusive titles, and more.
If you're still on the fence about which console to buy, this won't tell you outright. But it will give you all the information you need to make an informed decision.