VMTN recently posted a list of some of the latest virtual appliances added to the VMTN Virtual Appliance Directory.

• Vyatta, Vyatta is an open source router. Its primary components are: XORP - The eXtensible Open Router Project.See http://www.xorp.org (the XorpProject) for more information and Debian GNU/Linux.
• Gallery, The Gallery VMware Appliance is a GNU/Linux distribution based on rPath Linux.  Basically, it is a LAMP (Linux, Apache, MySQL, PHP) appliance with both Gallery 1 and Gallery 2 pre-installed and pre-configured, along with all of the required utilities and most of the optional ones.  They are both also pre-loaded with random pictures from the Gallery team so that you can test things out without even having to find your own images.
• Mambo, The Mambo Virtual Appliance is for web designers and system admins who want a simple, fast way to get a base linux server, with out of the box Mambo, up and running, so that they can serve to the web, or just develop Mambo sites.
  This Virtual Appliance was built as an easy way to get a fresh installation of Mambo up and running on a testing server so that you can build templates, see what they look like, and get them ready for production deployment elsewhere. It is perfect for the Mambo developer or beginner who wants to experiment.
• Freespire 1.0, Freespire is a community-driven, Linux-based operating system that combines the best that free, open source software has tooffer (community driven, freely distributed, open source code, etc.), but also provides users the choice of including proprietary codecs, drivers and applications as they see fit. With Freespire, the choice is yours as to what software is installed on your computer, with no limitations or restrictions placed on that choice.
• Subversion and WebSVN on Ubuntu Server, The purpose of this virtual machine is to act as a self-contained subversion server, with a fully configured WebSVN front end. Webmin is also installed for remote server administration, which should rarely be necessary. This virtual machine will let you drop in a source control system with minimal configuration. You can also use it to replace an existing Subversion server for maintenance purposes. Ubuntu Server should never need maintenance, and requires minimal system resources.
• DSL-N, DSL-N is built on Damn Small Linux technology. DSL-N is also small, bigger than DSL but smaller than most. DSL-N provides a reliable, and compact array of applications based mostly on the GTK2 libraries.  DSL-N is not an evolution of DSL, it is not intended as progress over the philosophy of DSL, but is intended for a different user, or the same user under different circumstances.
• Nu-CentOS-BQ-4.5, A fully open source descendant of the classic Sun Cobalt RaQ 550.
• Music Player Appliance, Music Player Appliance is a small network appliance designed to be an interface and backend for MusicPD, a music player daemon. It currently has a small rPath Appliance Agent configuration interface, MusicPD installed and configured, and the phpMp front end configured. Later plans include ZeroConf support, a more extensive rAA configuration plugin with support for mounting NFS and CIFS shares, and so on. Now also includes a live CD.