there are two main pieces of software which run on the router: lcd4linux and lcdproc. The first one is available in .ipk-s, the second one is easily compilable. See their web-sites which devices are supported. Personally I prefer lcdproc.
After some 1.5 years experience of usage I'd say that its most useful feature is the full screen clock. It's quite fancy to have a precise clock which is synchronized every two hours
P.S. Search the forum. There were several reports of success of this kind.