Adobe has updated Lightroom to version 3.5, which is available for immediate download. You'll find a mirror update for Camera Raw 6.5 there as well.
The updates add support for about 20 cameras, 26 more lens profiles, and several minor bug fixes. Added cameras include the Nikon Coolpix P7000, Olympus E-PL3, and Sony SLT-A77. The new lens profiles include four for Nikon, two for Canon, three for Sony, and 14 for Hasselblad.
It also fixes a couple of bugs: one for Mac OS 10.7 (Lion) and some tethered-shooting ones for Mac OS 10.6.8 (Snow Leopard). For all the details, see Tom Hogarty's note on Adobe's Lightroom Journal.