Software

Firefox 3.5, 3.6, and 4.0 versions have been updated. Download or update from within the program (3X versions, Help / Check for Updates. 4X versions Help / About / Check for Updates)
Thunderbird has been updated to version 3.1.10. Download or update from within the program (Help / Check for Updates.)

VirtualBox 4.0.6 “improves stability and fixes regressions.” (full changelog)
Download (be sure to update the Extension Pack and Guest Editions too).

Audacity is a free sound recorder and editor. Audacity Downloads

April 11, 2011: Audacity 1.3.13 released, and LinuxQuestions.org Audio Authoring Award 2010
The Audacity Team is pleased to announce the release of Audacity 1.3.13 (Beta) for Windows, Mac and Linux/Unix. This version now fully supports Windows 7 and contains many bug fixes plus a few new features. Please also obtain this version for Windows Vista and Mac OS X 10.6 rather than Audacity 1.2.

Release Notes

Updates include: Process Monitor v2.95, TCPView v3.04, Autoruns v10.07. See the Sysinternals Blog for more info.

MediaMonkey has been updated to version 3.2.5.1306. Download.

It’s a minor update that adds compatibility with the iPad 2, Verizon iPhone, and all iPhone/iPod devices running iOS 4.3 firmware

Download CCleaner (slim). Adds support for Firefox 4 and IE9 as well as other fixes and improvements.

Download Firefox 4.

Download or update from within the program (Help / Check for Updates).

Thunderbird 3.1.9 fixes the following issues in Thunderbird 3.1.8:
* Prevents a crash after update, that is affecting some users.

Download or update from within the program (Help / Check for Updates).

Firefox 3.6.15 fixes the following issues found in previous versions of Firefox 3.6:
* Fixed an issue where some Java applets would fail to load in Firefox 3.6.14

Mozilla has released Firefox 3.6.14 & Thunderbird 3.1.8 Download them from the previous links or update from within the program (Help / Check for Updates).