Centralized Data for RSS Aggregators

I’m a big fan of RSS Aggregators, but I’m having the same problem with them that I had with POP mail: if I’m using more than one machine, they can’t share data.

Someone needs to build a system that lets you store your OPML file and the “read status” of each feed/post online. This would also require buy-in from the major aggregators to support this service.

Either that, or a really good web-based aggregator with a nice rich interface needs to show up soon. I’ve been tempted to try to build one on several occasions but managed to stop myself. :) If someone out there is planning to build one, I’d be willing to help out on the interface.