Version 2.0 of the Random One Cat widget for WordPress was released today. This is a complete rewrite of the module to use the new WP widget class. That not only future proofs the widget but also greatly simplifies the code and reduces it by about half.
In addition this version allows you to display up to five random posts at a time, rather than just a single post.
Unfortunately the move to the new WP widget class means that any widgets you have already added to you theme with a previous version will be removed when you upgrade to version 2.0. I know that will be annoying but the benefits of moving to the new class far outweigh the effort to re-add the widget (i.e. this widget will continue to work in WordPress 3.1 and beyond).