So what with KDE 4.1.2, Python 2.6 and now Mono 2.0 and a new free windows Rails environment this week is turning out to be the worst ever for bankers but the best ever for development geeks.
Ruby In Steel is a new free (for personal use) Ruby on Rails IDE based on Visual Studio 2008. Download the installer and it will set up a full environment including MySql and Rails. I have yet to try it but I have seen the commercial version which looked quite promising.
Mono is the other big release (so far) this week. Releasing version 2.0 they have added major support for lots of API's including ADO.Net 2, LINQ, Cairo and System.Drawing 2.0.