I recently switched to Ubuntu on my work laptop as I was getting very sick of Vista32 and I've really found it to be a very good thing. I still use dual boot as there are some bits of software that I still need in Vista unfortunately and I couldn't get to run under WINE. On various machines that I run at home though, I've currently got Vista64 on the lot as this seems much faster and is more stable than its 32bit counterpart.
I was hoping to run Ubuntu on one of them which I use as an ftp server but I couldn't find a good enough intuative ftp server in spite of trying Pureftpd and various interfaces. In the end though I decided upon Filezilla under Vista64 as this is easy to use, stable and FREE!!! I did look at Ubuntu server but it became apparent very quickly that one actually has to know what one is doing so that ruled me out as I tend to work out what I'm doing as I go along…
On the subject of good Ubuntu wikis, I have never found one but the forums at http://ubuntuforums.org/ seem pretty comprehensive.
Good luck with your wiki!
Cheers,
Chris