I agree, there's no great way to search the readers rigs, but there is a great search engine in the member list. There's a button on the right hand side of the screen that says "search members" or something like that. Click it, and a box appears. Type in the members handle (i. e. andyman), and it'll present results. If the handle is not what you need to search by, click "search members", and then click "advanced search". THen you can search by stuff like "ICQ number" and such.
Hope that helps,
Andy