Cool aggregation, and I like the simplicity of the site. If you're looking for things to add (possible site bloat, so take it with a grain of salt) -- Maybe add some info on their data-retention/ownership policies?

I'm certainly going to look at improving the information that is available about each site. Perhaps icons to indicate ownership rights.

Definitely, though I'm not sure what kind of icon would properly indicate 'personal ownership rights', you could color-code.