You might look at one of the new small 4:3 format cameras.
They are smaller, lighter, but still have most of the features of a DSLR and have the APS size CMOS sensors that the DSLR cameras use.
Here are two:
http://www.steves-digicams.com/camera-reviews/sony/nex-c3/sony-nex-c3-review.html
http://www.steves-digicams.com/camera-reviews/panasonic/lumix-dmc-g3/panasonic-lumix-dmc-g3-review.html
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