Earlier today Adobe released Lightroom 2.6 and Camera Raw 5.6. And after some time with only unofficial or preliminary support, Canon EOS 7D RAW files are now officially supported by final Adobe RAW processing software. There has been release candidates out for a month, and it is not clear if the support has been improved in the final releases compared to these, but the final versions should be a vast improvement over the beta-versions and the unofficial support found in the older Lightroom 2.5 and Camera Raw 5.5 releases. Adobe Photoshop CS4 or Photoshop Elements 8 are required to install Camera Raw 5.6. If you have older Adobe RAW software, an option is to download the new DNG Converter 5.6 and use this to convert your 7D RAW files to DNG format. This will make the files compatible with older versions of Photoshop and Lightroom.
Download latest versions of Lightroom, Camera Raw and DNG converter from the Adobe website or use Adobe Photoshop and Lightrooms built-in update functionality. Lightroom 2.6 is a free upgrade for Lightroom 2.x users, Camera Raw 5.6 is a free upgrade for Photoshop CS4 and Photoshop Elements 8 users. The DNG converter is a free tool available for all:
Also DxO released DxO Optics Pro version 6.1 for Windows with 7D support a weeks time ago. You can download this RAW software in a trial version from the DxO site:
And finally Apple has released Digital Camera Raw Compatibility Update 2.7 which adds 7D support to software like Aperture 2.x and iPhoto '08/'09 for Mac. The update is available via the Software Update mechanism of newer releases of Mac OS X.
Update 19th Dec. 09: According to a little test by Secerator on the dpreview forum there's significant less noise in Lightroom 2.6 compared to the Release Candidate when using default settings without any noise reduction applied.