Anyone who has used Adobe Reader knows it is a huge resource hog.  On a older system or one with limited resources AR can slow you to a crawl or stop you altogether (actually this true of every Adobe product I have ever used!!!).  Well here is a sweet, sleek alternative:

Foxit Reader

www.foxitsoftware.com/pdf/rd_intro.php

It runs small and swift, either as a standalone app or from within your browser.