The link is to a rough Sudoku solver written essentially in browser-based XSLT, with a little help from javascript. It can get stuck on harder puzzles, but it creates a good set of "candidates" for each cell that could be used for establishing a base state from which to begin guessing.

http://seanwhalen.home.comcast.net/sudoku/

Some of the data was taken from Andrew Welch's recent posts on Sudoku at http://ajwelch.blogspot.com/