For those of you who a) use Firefox 3, and b) a RSS feed aggregator & reader, Feedly is the add-on you need.
Read the comprehensive presentation here on Mashable, so you'll get the whole picture.
I use Feedly since Day One (as well as Firefox 3, of course) : it's both simple and powerful, flexible and easy to set up and use. The page looks like an online magazine (which it is, at the end of the day), unlike Netvibes or GoogleReader. With its typical Web 2.0 attributes, such as The Wall where others can share with you recommendations and annotations.
Since Feedly is an add-on to your browser, you don't need to go to Netvibes or GoogleReader any longer : set Feedly as your homepage, that's all you need to do. Sure, you can do the same with your traditional RSS reader, but it's not "integrated" into your browser.
I'm convinced Feedly is another step forward to the true Enterprise 2.0, since it enables the user to aggregate multiple information and content onto a single page without the need to connect to an external website. A brief look at the Feedly's mash-up diagram tells me we've now everything in hands to create, implement, and truly use simple yet efficient & productive vertical *Web 2.0-based* applications...