If you really like doing some prototype testing, get your crash helmet and look at this thread:
http://forum.transmissionbt.com/viewtop ... 848#p37848
That's the Qt version, the latest (1.75) has some known bugs: GUI is default Qt unless you change the libraries with ones taken from Qt's developer distribution, slowly leaks memory, crashes if you delete several torrents, some times before crashing it just stops refreshing.
It hasn't been tested AFAIK as torrent server, I use it with a separate daemon, instead of using the Web interface (the Qt app has much more functionality).
There is also a GTK+ (for Windows) application, I could put an installer in the same place (its 10 times as big as the other) or, if you like to build it yourself take a look at this thread:
http://forum.transmissionbt.com/viewtop ... f=1&t=8742
And there is the option of non-GUI tools, if you like using Cygwin then building the daemon and transmission-remote is easy (even transmission-cli should work since ncurses is available for Cygwin).