One of the cool Google AppEngine hack-a-thon apps, WorkStack was written by Brandon Martin-Anderson. You can sign in with your Google account, and use it to keep track of your work items using a command line interface.

The concept is that you push items onto a stack, and pop them off when they are complete. It then tracks how long it took to complete each task (there is also a feature where you can add an estimate at the end of a task and it will compare your estimated to actual time when you are done).

Damon's Twitter Statistics site. Really cool visualizations about how you're using twitter - see how many tweets you send at different times of the day, where they are coming from, etc.

This article directly addresses the thesis behind Rescue Time - that interruption is a primary source of productivity loss. RT also has much more detailed data than that referenced in this article.

Seems to me that the Kaiser Foundation (http://www.kff.org/entmedia/internet.cfm) would be very interested in aggregate Rescue Time data for their media and policy studies.

Quoted: Multitasking might also be taking a toll on the economy. One study by researchers at the University of California at Irvine monitored interruptions among office ...

Tony's interview with Scoble about Rescue Time!

I like the new RescueTime home page - and especially the tag line (is it new)?

- Ridiculously Easy Time Management & Analytics

The value proposition is really explicit and easy to get now:

- Effortless Time Tracking
- Beat Interuption Overload
- Compare your Productivity

Note the clever SEO trick for the page title "Free Time Management Software | Rescue Time"

a) The company name is at the END not the beginning (better SEO for the search terms NOT the company name).
b) Includes the terms for the searches thay want to target AND has the eye-catching "Free" at the beginning for the SERP).

Quoted: RescueTime is time management software that helps individuals and businesses understand how they spend their time (with NO DATA ENTRY), and provides tools to help them spend it more productively.

Looks like a rescuetime competitor.

Quoted: Wakoopa tracks what kind of software or games you use, and lets you create your own software profile. Discover the best software and get to know who use 'em, for how long and why.