Written by
Simon Justesen
For umbraco versions:
AllHow-to
How to debug your user controls
Fellow umbracian with guru-like skills Christian Palm has made some bookmarks for the browsers Internet Explorer and Mozilla Firefox which will make your debugging experience with Umbraco a lot more comfortable - instead of typing the parameters over and over, you can do the same with just a click on a button:
See http://www.cpalm.dk/blog/2008/01/20/umbraco-debugging-made-easy.aspx for more information.