What can I do with two Airport Extremes?

So a buddy of mine is getting married (and owes me big for helping him move all of his stuff) - so he is giving me some of his tech toys… one of which is a pretty new Airport Extreme. I just bought one a while back and it works great.

I was planning on selling one on eBay, but then it struck me I might be able to do something cool with two Extremes. (I have a Express that’s collecting dust right now.) I have two unnetworked TiVOs, three Macs, a Dell laptop, and a Slingbox. Everything works great today except the Dell gets a really crappy wireless reception more than 20 feet away from the Airport Extreme.

So what do you think? Two Airport Extremes? Or should I get the cash?