Beans are a fiber powerhouse...canned, from dried, etc...beans are AMAZINGLY full of fiber. Fruits, veggies, and whole grains are also full of fiber. My fav high fiber recipe was already posted here:
http://www.3fatchicks.com/forum/showthread.php?t=99449
I try to get between 30-50g fiber a day...really helps to keep me full, along with my water.