An interesting technical note on Google App Engine. It is possible to get results back from a query that DO NOT match the predicate of the query.

This is because the data is committed first, and the indexes are committed later. So, there is a small window of time where results can be included in a query that don't actually satisfy the conditions.

The converse is also true. If you change data, and then perform a query expecting to retrieve the data you just modified, it may not be returned even though the change was committed.

These kind of race conditions could make some applications tricky to perform correctly.

Script browser simulations for web testing. IE specific - but a Firefox port underway.

http://code.google.com/p/firewatir/

Quoted: description goes here

And the stable version of Firebug for Firefox is here - version 1.05

A quick "mashup" using the Google Mashup Editor. Has this really been in beta for a year? I just took note, and got into the (closed?) beta.

I'm note sure I get the point. You pretty much have to be a developer to write these things, but I don't think you get much more functionality than just writing to their JavaScript API's.

What's the market for these things (or maybe that's why it's not gone public). Competes with Yahoo Pipes and Microsoft Popfly.

Firebug-clone for IE (from Microsoft)

Quoted: The Microsoft Internet Explorer Developer Toolbar provides a variety of tools for quickly creating, understanding, and troubleshooting Web pages.

HttpRequest and HttpResponse classes.

Quoted: Mylyn is a Task-Focused Interface for Eclipse that reduces information overload and makes multi-tasking easy. It does this by making tasks a first class part of Eclipse, and integrating rich and offline editing for repositories such as Bugzilla, Trac, and JIRA.

Quoted: Selenium is a test tool for web applications. Selenium tests run directly in a browser, just like real users do.