A great tutorial on how to implement sortable lists in Unity Editor by Valentin Simonov: http://va.lent.in/unity-make-your-lists-functional-with-reorderablelist/
Browserbased Image Editor
An amazing HTML5 based image editor for your browser: https://github.com/viliusle/miniPaint. Here is a demo.
TextMate Becomes Open Source
My favourite Mac-OS-X text editor just became Open Source. Developer Allan Odgaard announced this in a blog post. The sources of version 2 of TextMate that are still considered Alpha are now available on Github.
The choice of license is GPL 3 for now. Anything related to the code base, including contributions, can be discussed at the textmate-dev list or #textmate on freenode.net.