Layouts in Ruby on Rails
render, redirect_to and instance variables
Tagging vs. Cataloging: What It's All About - by Chiara Fox - A really good article about tagging and folksonomy.
Graphing sar reports
Tracking system performance with SAR
systat documentation
article about sar
Handy One Liners for Ruby
The Text Content-Type from Connected: An Internet Encyclopedia
StringIO
How To Upload Files on the Rails wiki
HTTP Caching
RJS and Content Type Header
ActionController Base
Setting the Request Content Type in Rails
Ruby QuickRef