OK, I read through to the end :-)

Awasu is not an online aggregator but might do what you are looking for. It has a new feature that lets you keep copies of Awasu running on multiple machines in sync. And not just channels, but everything – global settings, favorites, etc.

It’s still in alpha testing but if you’d like to give it a go, send me an email and I’ll arrange for you to get a copy. Otherwise, it will be released publicly around mid-November.