Timesheets are the bane of all software developers and consultants. Nobody does them on time, and I for one have difficulty remembering what I did during the week. I know I could simply fill in the timesheet each day, but heck, I am lazy. Over a few years, I've been writing and rewriting scripts to keep a timesheet in a CSV file, so that I can query it at the end of the week to see what I have been up to....
Over the years I've been involved with writing a number of web applications. Some I am proud of, some I never want to see again. During each project, testing of the application's performance, stability under load, and regression testing of user journeys always comes up. There are a number of great bits of hardware (eg. Avalanche), and software (eg. Grinder) that help you test applications. I've even had a fun time using a room full of Grinder clients to test web services for a client - a great way to run a denial of service attack :-)...