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At the end of January Adobe posted Lightroom 2.3 Release Candidate to Adobe Labs.
Release candidate status means the version is being considered for final release, but they are looking for wider user feedback before making it an official release. This particular version includes some significant bug fixes for Windows users as well as support for 2 new camera models (Nikon D3X and Olympus E-30). The response from other Lightroom users has been very positive so far. If you have been suffering with problems in Lightroom 2.2 I would encourage you to give this update a try.
You can read all the details and find links to download the update at Lightroom Journal.