Resolution, expressed in megapixels, is no longer relevant. Forget it when comparing cameras. I've made great 12 x 18" (30x45cm) prints from a 3MP camera and 40x60" (100x 150cm) prints from a 6MP camera. 6 Megapixels is all anyone needs for anything, and every camera here has two or three times that.
Resolution is nothing more than a sales pitch to get you to pay more.
Now that every camera has double-digit megapixels, camera makers invented another meaningless number they can use to extract more cash from the innocent, called ISO.
ISO is a rough measure of sensitivity to low light. It only matters if you shoot in the dark, and then shoot without flash. As soon as your flash pops up, the higher ISOs aren't used anyway. Even if you learn how to use the higher ISO settings of your camera (few people do), there isn't much difference between cameras of the same type and era, regardless of cost. All the higher ISO settings do is make the picture look grainier, and the cameras that sport the highest ISO settings look horrible at those settings!
This said, DSLRs are a zillion times better in the dark than point-and shoots, and the newest point-and-shoots like the Canon S95 are superb for use at night without flash as well.
Don't buy a camera because a salesman tries to smoke you with gibberish like megapixels or ISOs. They have nothing more to do with a camera's quality than the number of spot-welds used to assemble your car
These things are easy to measure, which is irrelevant because the factors that really matter don't have numbers attached to them.
Posted by Monroe Ohio photographer Vincent Rush, Cincinnati Sports Photography and Dayton Sports Photography of Monroe Ohio. Vince Rush can be contacted by phone at (877) 858-6295 or by email at firstname.lastname@example.org or visit http://CincinnatiSportsPhotography.com