Actually they are 2 good alternatives to FVU in the PC world: BreezeBrowser (BB) for any RAW-enabled Canon cameras (Sxx/Gx/EOS cameras) and Capture One Rebel Edition (C1Rebel), only for the 300d/dRebel camera, both in the sub-50 range.
I've used (and still use) BB instead of FVU for all my S50 RAW shots, and some 300D shots, but C1Rebel is much more advanced.
BB has the "advantage" to use the same Canon libraries than FVU, so the image quality is exactly the same than the FVU-generated pictures, but it's much more realtime.
C1Rebel uses it's own libraries, so the image quality differs from Canon-libraries programs. There is some differences in color rendition, but the C1Rebel workflow and capabilities are much better. Also the image generated is more "film-like" in the highlights, and you can recover more highlight information than with Canon-based software.
Regarding the color rendition issues, they are mostly solved in the current (V1.3) version of the software, but there is a couple of ICC profiles generated by third parties, than solve the problem. They aren't expensive ($20) and I'm using them now in a regular basis.
They can be downloaded from:
href=http://etcetera.cc/
BB can be donloaded as a trial from:
http://www.breezesys.com/
and C1Rebel from:
http://www.pictureflow.com/
http://www.c1dslr.com/