I have made some modifications to a few plugins that others might be interested in.
1. WP-Utterquotes is a modified and enhanced verion of WP-Quotes. (another quotes plugin)
2. Countdownj is a modified version of Owen's excellent Countdown plugin.
3. Narchivesj is a modified version of the Sortable Nicer Archives plugin that works with WP2.0.
For additional reading about the modifications, and to download, please visit my plugins page at http://www.jwurster.us/wordpress/plugins/.