Just noticed that lBook has released an updated version of their firmware
http://www.lbook.org/downloads/v3upd...6-20080619.zip
Apparently the main changes are:
PDF parser updated to version: V1.20.080619
Bookshelf updated to version: V1.20.0800529
I haven't tested it yet and can't provide further details since my Russian is almost non-existent.