I've been really happy with how the funplosion.com website has turned out, but it wouldn't have been possible without all of the great free and open source resources that are out there.  Some of these below I'm obligated to mention due to their licensing conditions, and some I'm mentioning just because they're awesome.  All were critical to getting the site up and running as quickly as I did.

Joomla Content Management System :: http://www.joomla.org/

famfamfam icons :: http://www.famfamfam.com/lab/icons/silk/

Inkscape vector graphics program :: http://www.inkscape.org

Paint.NET graphics program :: http://getpaint.net