If you want to enable url redirection for your entire dnn site or pages within your dnn site you can use dnn Friendly URL's by scripting the redirection in the "siteurls.config" file located in the DNN installation root directory. See the post on our community forum referenced below for exact details. Also we have included a link to dotnetnuke's pdf guide to creating Friendly URL's.
http://community.ihostasp.net/blogs/from_the_trenches/archive/2007/11/30/how-to-preserve-legacy-urls-after-moving-to-dnn.aspx
www.dotnetnuke.com/LinkClick.aspx?fileticket=1vDi5Hgy5zE%3D
&tabid=478&mid=857