I was reading Mac McSpirits Blog and if you are interested RC2... is available now for download. Take note however of what Matt says about the supportability of this download, I quote

"Please note: This build may not have the same level of support or servicing via Windows Update as RC1, and you may not be able to upgrade from this build to the final version of Windows Vista. To continue, please use the links below to start the download.  For those of you who would prefer to go with the supported 5600 RC1 build, you can still get your hands on it, here.  Enjoy! :-)"