The Xbox 360 is actually a bit smaller than the Playstation 2. If you really compare them very closely, you will see why the Xbox 360 is a bit smaller than the Playstation.
Now If you think that the Xbox 360 is much bigger than Playstation 3, you have been fooled by images like this.
FakeHow the hell is this even possible correct? (the link above)
Trust me, Xbox 360 will be smaller in person.
IF you scroll down..If you scroll down, you will see a comparsion of Xbox vs. Xbox 360
Last thing, there is a picture, well sadly a photoshopped picture of the newer smaller version of the Playstation 2, the Xbox 360, the Playstation 2, and the Playstation 3, as I said, it was photoshopped, but it should give you an idea of a size between Xbox 360 and Playstation 2, although I have no idea why he didn't put in Xbox also, but the Playstation 3 size compared to the Xbox 360, is that Playstation 3 is not smaller, but bigger. As I said... photoshopped..
A better picture of Xbox and Xbox 360
BetterThe Xbоx 360 weights 7.7 pounds (3.5 kg) and is:
309 mm wide x 83 mm high x 258 mm deep
12.15 in wide x 3.27 in high x 10.15 in deep
The Xbоx weights 8.8 pounds (4 kg) and is:
320 mm wide x 101 mm high x 260 mm deep
12.6 in wide x 4 in high x 10.2 in deep