Jake of the Web

http://pumpkinmasters.com/free_patterns_main.asp
A few free patterns. Simple and direct, but good.

http://pumpkinglow.com/
Non-Halloween jack-o-lantern patterns; Famous people, Patriotic, Christian images, Animals, and more. Turns out this site is based in Smithfield Utah, just north of Logan, so there's also a Utah Aggie pattern!

http://www.pumpkinlady.com/pattern.htm
Some fun and simple patterns but very good (you have to scroll past quite a few ads for her admittedly good books that are for sale). Excellent designs overall, there are probably over 100 patterns here.


http://www.carvingpumpkins.com/
Probably the best assortment of patterns and ideas out there: Hundreds of free patterns, with photos of jack-o-lanterns the site owner has made over the years; Simpsons, Family Guy, Dora, Patriotic, Lord of The Rings, Wizard of Oz, and LOTS more. Many of these are likely for more advanced carvers, requiring more time and effort than the traditional jack-o-lantern, but with more impressive results.