Hooray — the official 2.3 release of Lightroom is out.  This fixes a number of bugs in 2.2 that I am happy to have behind me.

From Adobe:
The goal of this release is to address bugs that were introduced in previous releases of Lightroom 2 and provide additional camera raw support. A comprehensive list of issues fixed in this release is included below:

• In the Windows 64-bit version of Lightroom an sFTP upload process could cause Lightroom to crash.
• Slideshows could return to the first image randomly during playback.
• A memory leak could cause Lightroom to crash while attempting to process files with local adjustments.
• Canon EOS 5D Mk II sRAW files could process with artifacts in Lightroom 2.2.
• Lightroom 2.2 could cause disc burning to fail for Windows customers.
• Attempting to undo(CTRL-Z) a single step in Lightroom 2.2 on Windows could cause a series of previous actions to be undone.

I actually installed the early release of this a few weeks ago, and no longer experience the crashes that I had with 2.2.

LR 2.3  and ACR 5.3  also introduce support for the Nikon D3X  and the Olympus E-30.

Updates are free.  In Lightroom, go to Help>Check for Updates to install LR 2.3.  In Bridge, go to Help> Check for Updates to install ACR 5.3.