Yeah, Aldiko looks like the best candidate when either having added some plugins for additional formats (more than 20 more I think), or just have this multiformat readability/conversion built in. Just watch its versions progression. Out of Adobe PDF reader's alternatives I'd like to see Foxit for Android.On the other hand, at current level of firmware, we have a lousy, slow as molasses images (PDF images) scrolling, browsing, and overall handling, just check your stock gallery app. Which basically excludes several millions of Google books, and it's a great shame for an eReader. Now, some estimates for some e-reader apps may drastically change as we'll move to 2.1 with modded (improved) graphic drivers. Plus maybe (re)partitioning of internal card, reshuffling and deleting lots of crap like regular dalvik cache dumps for debugging. Which is now up to the nostrils, after every FC-ing incident, heh...