Slick-Util is fairly outdated and there is a catch-22
I wasn't not sure whether I should bring up this issue with you guys or the LWJGL guys, but I came here because it was hosted on your domain. Slick Util hasn't been updated since June of 2010, and I'm sure there has been a lot of changes to the Slick2D codebase since then that involves some of the classes Slick-Util uses.
In addition, despite Slick Util being new enough to have deprecated the TrueTypeFont class, the replacement UnicodeFont class was not packaged in the .jar file!
Is the Slick2D team responsible for the maintenance of Slick Util? If so, please update the Slick Util package sometime soon.