This is what I have been able to get to work:
Qpdf2 (qpdf2_no-render-2.2.1-20040217_arm.ipk)
Opie-Reader
Both work in VGA mode, and quite well, although Qpdf2 can be a little slow in rendering documents with complex graphics.
Not much, (yet) but, hey, it is only 24 hours I have owned my SL-6000L....
Now, on to a serious challenge: find a video player that can stream RealPlayer and Windows Media Player files.........