Tab

pdf reader/annotater

mantano. Pretty good. Links work; can use pdf bookmarks. Export annotations? Annotations a bit annoying
beamreader. Many characters don't show up (eg ff ligature), which makes it unusable. Pdf links don't work.
ebook. Can't read while zoomed in (no way to turn page). Links work
ebookdroid. Not great for pdfs ... links don't work, turning pages not great, no annotation. Only thing that works for djvu files I think.
Repligo not yet tried
ezpdf not yet tried