The below is from a Slashdot comment, so should be taken with a grain of salt, but he does site his sources and the comparison seems to match everything I've read. I'm simply using it to save myself some time. I'll summarize: Advantage PS3. The only thing the Xbox 360 has going for it is the release date and (probably) the Xbox Live stuff. Enjoy!
Xbox 360 has a CPU FPS of 45 GFlops*
PS3 has a CPU FPS of 218 GFlops
Xbox 360 has a GPU FPS of around 955 GFlops**
PS3 has a GPU FPS of 1.8TFlops
Xbox 360 has a combined FPS of 1TFlops
PS3 has a combined FPS of 2.18TFlops
Xbox 360 has a DVD-ROM
PS3 has a BD-ROM
Xbox 360 is WiFi ready
PS3 is WiFi built-in
Xbox 360 has 3 x USB 2.0 ports
PS3 has 6 x USB 2.0 ports
Xbox 360 has support for 4 wireless controllers
PS3 has support for 7 wireless (Bluetooth) controllers
Xbox 360 uses Memory Units
PS3 uses MS Standard/Duo/Pro, SD standard/mini & Compact Flash Type I/II
Xbox 360 has support for select Xbox1 games
PS3 has support for PS1 & PS2 games
Xbox 360 has support for 1 720p & 1080i display
PS3 has support for 2 480p, 720p, 1080i & 1080p displays
Note:
* Derived from CPU Game Math Performance of 9 billion dot product operations per second
** Derived from subtracting published Overall System Floating-Point Performance of 1TFlops with derived from CPU Game Math Performance of 9 billion dot product operations per second
Source:
Wikipedia's PS3 Tech Specs
Official Xbox 360 Fact Sheet
Formula for Dot Product Operations Per Second to GFlops