Free alternative PDF readers - Foxit Reader, Nitro Reader and PDF-XChange Viewer

Comments on the free alternative PDF readers

Foxit Reader: support annotations, load PDF quick, version 4.3 works well under Linux WINE
Nitro Reader: best for normal user, Office 2007-like easy-to-use interface, support annotations, built-in PDF creator
PDF-XChange Viewer free: support annotations, support OCR (in version 2.5), support page rotation.

Feature missing: merging pages, extracting pages -- solutions: PDFill

ref:
Battle of the alternative PDF Reader (Foxit Reader vs Nitro Reader vs PDF-XChange Viewer)
Best Free Non-Adobe PDF Reader