iTunes 9.1.0.79 No longer shows shared libraries.
1. Go to Start>Settings>Control Panel>Add/Remove Programs
2. Uninstall Bonjour (this seems to be the problem with sharing)
3. Then, if you can get hold of it, install the previous version of Bonjour (the one that came with iTunes 9.0.3)
4. Restart iTunes and your shared libraries should now be showing.
Good luck, this is the only solution I have at this stage. 😉
Intel, Windows XP Pro, P4, 3.4GHz, 4GB RAM, XP SP3 - iPod 80GB Classic