Interesting question, made me go read about ReaMote (but I can't think of a VST which would be necessary) and then I also remembered Wormhole. Seems like Ethernet might work, otherwise maybe it would be possible to set up TCP/IP over Firewire? Just having crazy-ass ideas here too! There might me some more Audio over LAN commercial solutions...?
plasq.com - Wormhole
wormhole2 - Google Code
ReaMote - CockosWiki