Daffy--I'm the recent proud owner of an iPod Touch as well. I'm loving it as well--even though like you, I'm a die hard Windows fan. The Touch has replaced my aging Palm PDA--and it's great!
I have been successful at getting books uploaded through the Stanza software, but it did take some doing. I don't remember everything, but do know that I had to re-install the Stanza desktop software at least twice. Something about the Stanza software not properly acknowledging that Bonjour (Apple's networking stuff) was properly installed on my system.
But, I also will be doing most of my reading on my reader (in my case a Sony PRS505). It is so much easier on my eyes than the backlit Touch!