I'd like to mention FBReader 0.6.3
, an open-source e-book reader for the Sharp Zaurus
with 240x320 or 640x480 screen resolution (Qtopia-based ROMs or pdaXrom). Originally it was written to support the FB2 format
(an XML-based format quite popular in Russia), however it now also support plain text as well as a subset of HTML (HTML images are not supported yet). The reader also supports GZIP and ZIP archives.