That's... amazing. I was about to create a thread about the matter, and looks like sigtau preceeded me.
The utility of a downloadable FS Wiki, IMO, depends on the contents people are interested on:
1) If you're looking for canon info, the downloadable version is superb: main campaigns, ships, weapons and other topics related to canon have an excellent coverage;
2) If you're looking for info that continuously needs to be updated, like FSO revisions, the downloadable Wiki may lead to confusions. This wouldn't be a big problem, I think, if the downloadable version is periodically updated;
Overall, the idea is good. If we can also find a nice way to distribute the Wiki (Turey's Installer), the outcome may be awesome.