The Nikon D3100 is an entry-level DSLR. It appears to be very competent, especially if you ignore all the fluff features.
The two biggest external improvements over the D3000 and D5000 are a dedicated advance-mode switch (Single, Continuous, Self-Timer or Silent), and dedicated movie-start and live-view controls.
I hope the D3100 eliminates biggest faults of the D3000, which were taking way too long to process and record images made with ADR (Adaptive Dynamic Range), poor high-ISO performance, and locking-out image review controls until after you hit the PLAY button. Those problems were unique to the D3000, so I hope they've been swept under the rug once and for all.
If the D3100 fixes these problems, the D3100, since it offers Nikon's latest Second Generation image processing, should hopefully become my first recommendation for a low-cost, high-performance DSLR to replace the Nikon D40. Today, the old D3000 is so crummy that I have to suggest the more expensive D5000 instead, so if the D3100 works well, we hopefully will have a new winner. We'll have to wait until I get my own D3100 in September to know for sure.
The biggest thing that Nikon claims about the D3100 is that it will actually autofocus as you shoot movies and in Live View, which is a world's first for any SLR.
Nikon also claims the rubber grip provides a better fit, but they don't say to what.
A big deal is that the D3100 claims to be lighter than the D40! If so, this would make it Nikon's lightest DSLR ever, and a big advantage for everyone.
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