Editing video on a PC, below the professional level, has been dominated by Adobe Premiere Elements and Corel VideoStudio (formerly Ulead VideoStudio). But there have always been other worthy alternatives, and one of the most capable is Sony's Vegas Movie Studio. With each version, Vegas has improved, and now Sony hopes to give Vegas's eleventh incarnation a jump on its competitors by adopting a major feature they don't have yet.
The big news is that Vegas 11 now supports editing of stereoscopic 3D footage. There still aren't that many camcorders available which can shoot this format, with just a smattering of models available from JVC, Panasonic and Sony, such as JVC's Everio GS-TD1, or Panasonic's HDC-SDT750, HDC-TM900 and HDC-SD90. But YouTube now supports 3D, and it's becoming a tickbox on HDTVs as well. So there are plenty of options for watching 3D already. Up until now, though, all you could do with 3D footage you shot yourself was preview it, maybe trim the clips, and then play it back.
With Vegas 11, you can import 3D and edit it on the timeline, just like regular 2D. However, this isn't a completely seamless process. First, you need to open the Properties panel for your Project and enable one of the Stereoscopic 3D modes. Options include full- and half-frame side-by-side, anaglyphic, line only, or just the left or right frame. However, this just refers to the way the 3D is shown onscreen, not how to interpret the files you import. You can also output 3D to an external device, including a secondary monitor or stereoscopic display hardware.