Version 2.5.1 of WordPress is now available. It includes a number of bug fixes, performance enhancements, and one very important security fix. We recommend everyone update immediately, particularly if your blog has open registration. The vulnerability is not public but it will be shortly.
Here are some WordPress 2.5.1 highlights:

Performance improvements for the Dashboard, Write Post, and Edit Comments pages.
Better performance for those who have many categories
Media Uploader fixes
An upgrade to TinyMCE 3.0.7
Widget Administration fixes
Various usability improvements
Layout fixes for IE

[WordPress 2.5.1 - WordPress Blog]
Happy upgrading!

FOSSwire have posted a PDF “Ubuntu Cheat Sheet,” covering the basic terminal commands one might have to use and, just as importantly, naming important programs and packages.
With “Ubuntu Cheat Sheet”, you don’t end up deleting or messing with something that’ll cause headaches down the line.
You can learn how to use Ubuntu with command line
Ubuntu Cheat Sheet [FOSSwire]