I'm a pretty keen amateur. I have a Canon 40D and several lenses, tripod etc plus a Panasonic Lumix compact which is great fun. It's only 6mp but has a 10x Leica zoom.
It's the lens that makes the difference I think. The Canon has a APS-C size sensor and 10.2 mp but on a good day in good light I cannot really tell the difference viewing the image at a regular distance on my 1920x1200 screen.
The little Panasonic was only cheap as well.
My subjects are mainly landscape and abstract although I've just started a project on suburban and urban sheds. UK allotment/garden sheds tend to be self made ramshackle affairs where a bit of plastic conservatory has been tacked onto an existing wooden structure which has itself been extended with unloved old doors and pvc sheeting. I like the faded but once gaudy colours and the weathered timber mixed with concrete block work and so on.
I'm also going to attempt to combine that with portraits of the shed owners.
My landscapes tend to be both rural and urban as I live in the once industrial North West of England where former Mill towns stand in the middle of beautiful Pennine Hills and moorland areas.
I think it's a great hobby. It makes you look at everything differently whether you have a camera with you or not.