I ran into a well-known, but odd IE6 caching bug this week. If caching is turned off for IE6 browsers, modifying DOM elements triggers the browser to reload any resources referenced by the changed elements. So if a script changes the class name of 5 elements and the CSS classes have a background image property, then the background image will be reloaded once for each DOM update. This sucks the performance out of a web application.

There are several work arounds, but the best I’ve found is a simple IE6 Javascipt toggle that turns off the behaviour.

A good overview of Flickr’s setup. Nearly all of the techniques used by Flickr can be applied directly to Amazon’s cloud EC2/S3 services with faster scaling, at a lower initial cost.

Ryan Tomayko writes about a new Git hosting service. It hooks into Lighthouse and Campfire, and looks web2.0-ish too.¹

1. Not that web2.0-ish means much, but that style of site is really easy to grok ↩

Sketchcast.com. A cool w2.0 tool for broadcasting sketches.

Restructured Text to anything, an attractive online tool to convert reStructuredText to PDF and HTML.

Take a look at the Ext library documentation and examples. Ext is a Javascript UI framework that looks as good as any client-side kit I’ve seen (and the docs are fairly complete too). Also check out the World of Solitaire, an impressive DHTML Solitaire game.

A slick rich edit component based on the YUI Javascript kit.

Bubbl.us, a fun web2.0 mind mapping tool that shows some UI promise (thanks John).

A reddit-like site about YCombinator news, staring mostly startup and web2.0 stuff.

A web2.0ish code-free form builder, an interesting way to develop simple surveys and stuff. Looks almost usable for normal people.