my goal is to set up a VPN on a Windows machine that contains my iTunes library then connect to that VPN with my iPhone and be able to utilize Home Sharing remotely. I have read that this can easily be set up if the iTunes library is on a Mac (Network Beacon and YazSoft ShareTool are two products I quickly found). I can't find anyone who has had success on a Windows machine, though.

In my thinking, there are two options (aside from buying a Mac):

1.) Existing utility that takes care of this for me (like the Mac-only options listed above) and is compatible with iPhone (Hamachi is NOT compatible with iPhone VPN)

2.) Manually configure a VPN to allow Bonjour multicast (can't find any information on this)

FYI my router is a Linksys WRT54GL running Tomato 1.28