Foxit, a free PDF reader, may offer better and safer functionality than Adobe’s PDF Reader (aka Acrobat Reader). More on Slashdot and Computerworld.
Foxit by default runs in “safe mode”, disabling most potentially exploitable functions (that are usually unused and just an annoyance).
We may want to consider switching to Foxit as the default PDF reader, EULA permitting.
Update: Lifehacker.com reports that Nitro PDF also has some cool features, such as annotation, in addition to providing a convert-to-PDF feature. http://lifehacker.com/5548047/nitro-pdf-reader-provides-advanced-pdf-tools-for-free