Here’s a good post about using a URL ReWrite Map to manage redirects for your site. Anyone who has set up 301 redirects for their site (which should be anyone who has ever renamed a page or moved content) knows how much of a hassle it can sometimes be managing multiple rules. This article shows a good way to manage that chaos and make redirections easier for you.
http://www.orcsweb.com/blog/peter/how-to-create-multiple-301-redirects-url-rewrite-map/
Happy hosting!