If you need a slick JSP Tag Library for sorting and paging data, the display tag library is a great library to use. However, it's got issues - just like any piece of software. I've fixed a couple on my own, but it definitely needs some work - and integration with Struts (i.e. for getting messages, or referencing forwards) would be awesome.
The problem is that Ed Hill doesn't seem to be working on it anymore - and there hasn't been a release since May 2002! Since I do have the source it wouldn't be hard to create a project at SourceForge for it. It would be great to get some input from Ed though. Last year, I think he even did a presenation on JSP Taglibs at Java One! I know there's lots of Struts developers that use the <display> tag - I wonder if they'd be interested. I think I'll send this to the mailing list (and cc Ed) and see what happens.