I'm not sure about the current version, but the 1.4 version had a very nice text reader. I know where to find an actual homebrew of it. Not sure if it can read RTF though, I'll check in a bit.
EDIT: No, AKAIO 1.5.1 cannot natively read RTF files.
EDIT: No, the homebrew Textviewer, which is what, I think, AKAIO used, cannot view RTF.
My guess is that DSReader will be able to. Also, Textviewer can set bookmarks, not sure if AKAIO can.
EDIT 2: Yes, AKAIO can set bookmarks.