Webnab is an RSS/Atom feed reader for PSP, not yet as featurefull as the 2.6 one, but runs on 1.50 and 2.00.

Changelog:

* Font rendering now done with freetype, you should be able to replace the included font file with another named the same.
* Fixed up rss feeds that put the data in a block (like wordpress blogs)
* When there is no items in a new feed, don’t leave the psp in a state where it can crash.
* Fix rendering of news items with long titles.
* Give news items an additional line to use.
* You can now abort downloading a feed by pressing square and triangle.
* When downloading we now report the size downloaded instead of printing dots.

http://localhost.geek.nz/webnab/