Frank Gruber published an article called The State of Online Feed Readers. I have never found an online reader I like very much – and I have tried – but this article gives a good overview of what’s out there. Right now my personal choice is NewsGator Online, because of its synch capabilities with NetNewsWire.
I don’t understand the hype about Rojo, which I find to be needlessly crippled by the fact that it tries way too hard to be viral. In several places in Rojo the user is presented with the ability to add a friend’s email address to make them a “contact”. Uh, right. There’s not a chance I’m going to put an email address in there and have them spammed by yet another such service. Rojo does give the ability to search for contact, but without really robust discoverability, the whole “contacts” business (in Rojo and many others) is pretty lame.