Trusted Reviews has published a review of the Sony A300.
Image quality is pretty much identical to the A200, so no surprises there. The same 10.2-megapixel APS-C sensor has been used in the A100 and A200, as well as the Nikon D60 and D80, and it is a well-proven piece of kit.
For the latest news and reviews, check out Photography Bay’s Sony A300 Reviews and Resources.