DNN itself doesn't support this out of the box, but there are tools to make this possible. Check out http://www.ifinity.com.au 's URL Master module, it will allow you to do this. 

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Chris Hammond
Former DNN Corp Employee, MVP, Core Team Member, Trustee
Christoc.com Software Solutions DotNetNuke Module Development, Upgrades and consulting.
dnnCHAT.com a chat room for DotNetNuke discussions

Thanks Chris for the link. Just to add to this thread : there's not much point going down the route of trying to plumb in another .net rewriter and configure it that way. When dealing with Urls in DNN, you have to deal with three areas: - rewriting (converting a friendly url into /default.aspx?tabid=xx etc - friendly url generation : making sure the Urls generated and used within the framework appear as you want. The Friendly Url Generation process provides the links for all the menus, module links, etc etc. - redirection : if you update your Url scheme to , say, remove the .aspx extension, you need to be able to handle all the urls that still have the .aspx extension on them, and make sure the user (or search engine) ends up where you want them to. I've written on this topic in much more detail at http://www.ifinity.com.au/Blog/EntryId/61/Understanding-DotNetNuke-Friendly-Urls-and-Url-Rewriting-for-SEO I sat down to solve this exact problem 3 years ago and the Url Master / Friendly Url Provider modules are the result. You could mess about with other tools to try and fix it and reinvent the wheel, but trust me on this one, you're far better off with a proven solution that plugs straight into the framework and save your programming talent for other problems.