Other: Google Docs Viewer. Personally, I use this Greasemonkey script, add-on is available for FF & Chrome: http://blog.arpitnext.com/gpdf
Hi; PDF Xchange Viewer for me! Have been with Foxit for a long time (after Adobe) but I like PXV more now because of the added features.
Sumatra is a great simple PDF reader. It's my favorite. But I like Adobe Reader as well. Adobe Reader's code is getting very secure, thanks to all the current scrutiny.
1: Sumatra doesn't let me change the background colour of the pdf document. Foxit and Adobe allow this. 2: Adobe allows one to drag (or extend a selection of material), copy and paste elsewhere as text. Foxit used to be limited to the present screen. (Maybe that's changed with their view as text option?) 3: Both Adobe and Foxit allow for deactivating javascript. I don't know how Sumatra handles js.
Re. 2: Sumatra also does this quite well (ctrl+left click and drag). So now my only excuse for not using Sumatra is that I can't change the colour of text or the page background, both of which are doable in Adobe & Foxit. Maybe if I ask nicely @ the Sumatra forum ...?