Lots of activity around the blogosphere regarding Lightroom 3 - all comments seem positive. I use a PC so I can't comment personally as this version is not yet available, but we have Jeremey who feels "It looks good... still rough around the edges in areas, but much improved in others."

His blog post goes into more details on one of the more negative points "The flash gallery looks nice but the images are washed out. They look like they haven't been converted to sRGB, even though they are sporting sRGB profiles. Either that or the flash renderer fails to handle profiles correctly. Something's not right, but it could be that I forgot to check some box (like the "do the right thing" box). But given that Lightroom should just manage color correctly and not bother me about it, it's a little disappointing. "

Photoshop News has plenty of screen-shots. They conclude that "Lightroom Beta 3 has come a long way since the release of Beta 1 last January 9th at MacWorld, but we're probably only about the mid point through the beta process. Critical functionality such as syncing between a laptop and a workstation is being worked on even as I write. Being able to maintain multiple processing settings per file is also yet to come-but it will. We hope that other cool new functionality will be added."