With Windows XP well into deployment and more manufacturers starting to beat the drum on how wonderful life is with a UPnP enabled router, I thought I'd see whether UPnP is something that you just won't want to live without in your Internet sharing device. If you're the impatient type and just want the bottom line on what I found, you can get it here.
After checking with my vendor contacts, I found the only UPnP-enabled routers that I could get my hands on right now ("now" being April 2002) were the the Linksys BEFSR41 (with firmware 1.42.3 or higher) and the D-Link DI-804 (with firmware V4.67 or higher). So with routers in hand and Windows XP Home installed on one of my test machines, I set out to see what I could see.
Update 8/2/02 Additional routers that support UPnP are: MultiTech RF550VPN and D-Link's DI-604 [reviewed here] (with 2.0f firmware update).