1) Faster AF (coming from a D60, it's significant jump - have missed a number of shots in my paid shoots due to the relatively slow AF)
2) Cleaner images at the higher ISOs (ideal for some low-light stuff which I shoot).
Many things... but the following ones are what's really tempting me to upgrade!
1) 5fps, 23 frame JPEG buffer (i enjoy shooting sports)
2) Ability to reach 16mm with 10-22 EF-S lens (i love ultra-wide angle FOV)
3) 0.2s startup time as compared to 2s+ on my 10D (very useful)
4) USB 2.0 (USB 2.0 card readers have often failed me and downloading off camera is too dang slow!)
Also new is an in-camera black and white mode with digital color filters which work in the same way as a color filter would on black and white film. Additionally you can also apply a 'tone' to the black and white image (sepia etc.)
I thought the only plus factor is low ISO noise (and its black).
5FPS but 6 frame raw buffer seems kind of sucky. and at 5.6mb/s write speed, writing a single raw file to disk takes at least 1.5 seconds.
however, must see how it fares with simultaneous read/write. wait for full review..
the startup time is what really tempts me, i've missed opportunities waiting for the 300D to awaken. after that, the improved autofocus sensitivity in low-light. and since i'd be upgrading from the 300D, AI Servo/One Shot selection.
which means to say, i can't quite justify buying one yet. :bsmilie: