I haven't done any DSLR photography for a few years now but recently dragged my old Nikon D50 out of the cupboard and have been thinking about doing an evening course. I'm not hugely technically minded so am not really up on different specs, photography developments etc and was wondering if I was thinking of upgrading (I've got some vouchers I need to use up so a new camera is one option) what would be the main benefits. The D50 doesn't do filming and the autofocus tends to hunt around a bit sometimes so I guess those would be two areas of improvement. Any other main ones?