We haven't covered a Pentax SLR since the *ist D in 2003, but they have released a series of updates. The latest was replaced by the K100D released earlier this year at $700 and their higher resolution, environmentally sealed, $900 K10D. Both cameras take the same bevy of Pentax lenses, but the K10D is the more interesting model. Priced at the upper cusp of the entry-level segment (under the Nikon D80 at $1000), along with the Sony DSLR-A100 (and arguably the Olympus E-1?), it's carving out a new niche between the bottom entry level EOS Rebel and the semi-pro bodies from Fuji and Canon's 30D. These cameras, like the K10D, have an established list of lenses and are trying to be noticed by useful features and support that Canon has not made available in its mid-level (or at all): features like environmental sealing, anti-dust filters [finally available on the EOS 30D], and in-body image stabilization. Nikon's already identified this new segment creating the D80 to fit in with it, but Canon currently exists above and below it.
The K10D has some additional nice features not found on other bodies, the neatest being the magic green button which can be used in any mode to reset exposure as if it were in automatic mode; a feature very useful when in changing lighting. The K10D takes SD cards which pack-smaller, but have tended to be pricier for CF at the same size (when available). Pentax and Samsung have entered into an agreement similar to that of Leica and Panasonic, and while the K10D is essentially the same cameras the Samsung GX-10, there are some physical differences between the two and accessories may not be compatible with both cameras (such as the K10D's vertical grip).