This is the SLR camera bag isle. Welcome!
You can find mostly Tamrac and Lowepro camera bags, and for those with higher demands, there's always the Million Dollar Home series from Crumpler.
Tamrac and Lowepro produce, by any industry standards, high quality products and I would recommend them any day. In fact I'm doing it today as well. They are great if you are looking to carry one camera body and a lens or two plus, perhaps, a few accessories. You can check out the dimensions of any bag, if one product description misses the dimensions make sure to let me know. The camera bag dimensions are quite important, because you want to make sure you can fit your equipment.

One industry secret I'll share with you, is that if you have 2 lenses, you can mount one on the camera and put the other one on the bottom of the bag and you can carry them both safely. That doesn't really work all that well if one of the two lenses is a long lens like a 70-200mm. There are solutions for this, like lens sleeves that attach to a side of a Lowepro Toploader for example, but I don't recommend that. It's not as safe, and it starts looking bulky, besides why would you save $50 bucks and sacrifice the safety of a $2000 lens?! If you have a long lens or more than 2 lenses that you usually carry, I highly recommend the Million Dollar Home from Crumpler or some larger cases from Tamrac, Lowepro and Kata (these are not on the shelves just now, but if you have your mind set on one, write me and we'll see what we can do). And of course the safest and most 'civilized' solution would be a camera backpack.