Here are lists of aggregators/RSS readers for various platforms and needs. This list is to be used as a starting point and is by no way exhaustive.
iTunes
For Mac and PC, download this to organize and experience media, transfer media to your iPod or use as a RSS Feed Reader.
Accessible iTunes
Accessible interface for the iTunes software for use with JAWS.
Accessible Feed Readers : Aggie and Bloglines
Aggie the Aggregator
is an accessible RSS reader.
Bloglines: Use this Web based RSS Reader in place of a desktop one. Free. Recently received positive reviews from
the Blind Access Journal.
Mac : Net News Wire
Net News Wire is an easy to use RSS reader for Mac OSX.
Web Based : Bloglines
Use this Web based RSS Reader in place of a desktop one. Free.
Windows Basic : Sharp Reader
Sharp Reader is a simple
RSS reader for the Windows platform.
Windows More Advanced : Feed Demon
Amongst other things, Feed Demon lets you download
podcasts directly to your iPod.
Linux : Straw
Straw is an RSS reader for GNOME desktops.
Firefox : Sage
There are many RSS Feed Reader extensions for various browsers. This one is simple and aesthetically pleasing. Free.