Using Outlook 2007 or Vista and wish you could preview PDF's like you can Word and Excel documents? Now you can.

Adobe PRF viewer for Outlook 2007's reading pane and Vista's Windows Explorer
http://ryangregg.com/PermaLink,guid,a29ee2d7-6863-4b70-9fcb-b7db392f9a74.aspx

Have Foxit Reader instead of Adobe Reader?
http://timheuer.com/blog/archive/2007/02/27/14001.aspx
As of now, only works only with Vista (and Outlook 2007 installed in Vista).