Isn't the TatukGIS viewer Vista compatible? I am hearing that for the first time. I know they had serious performance problems with their developer kernel - which they never acknowledged to my requests, so maybe they have a real problem. The problem is, it will be hard to find a free viewer that can replace TatukGIS, because frankly its the best. I know of many of half assed ones, but they are not very nice to use, and have very limited functionality (free).
On second thought, Saga GIS could be interesting if you have the time to learn how it works. It has the advantage of being a full GIS system, with editing possible, but it comes with hardly no documentation at all, and I find it pretty hard to set up a map.
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