Hi,

Look at the various versions of Dragon that run under wine. So far the gold standard seems to be either DNS 7.3, which is VERY fast and available cheaply because it is obsolete, and DNS 9.0 preferred, which is slightly slower and lots more accurate. 
DNS 10 Standard is a GREAT program and it's what I use, but it has one annoying bug that makes it crash every once in a while. You may wish to wait for that bug to be fixed. 
DNS runs very fast and very accurately on Linux for continuous speech recognition into Notepad. It's head and shoulders above anything else. It's even faster on Ubuntu's real-time kernel, but that kernel itself has bugs, so I wouldn't try it right away with Intrepid. (OK if you have Hardy.) 
I understand your wanting to use the Vista speech recognition

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Thanks!