DD-WRT v23 SP1 RC1 firmware is now available (as of May 8) on the dd-wrt website. It's found under the "dd-wrt.v23 SP1" directory on the downloads section of their website.
There are ALOT of fixes and updates (over 200, looking at the changelog) since the original v23.
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If you're willing to take a little risk, you may want to give this a test now, before SP1 goes final and you find a feature you need, doesn't work... Make sure you read the hwsupport.txt file and the WIKI before you load the firmware.