http://www.nitroreader.com
I don’t have time for a full-fledged review, but this program is pretty good. Being a 25Mb download, the program is definitely lighter weight than the Adobe offering, well, during install, anyway!
NitroPDF Reader has gone through a UI revamp when they released 2.0 in June, and have now included a few highly-requested features such as browser integration for IE, Firefox and Chrome and an enhanced thumbnail handler to preview your PDFs.