I appreciate very much your work! It's better than our at http://virtualappliance.manthys.it... ;-)
So we decided to turn our project to Open virtual appliances based on TurnKey Core and try to collaborate with this community.
Our first work has been XMail Server (XMail Server 1.25 + PHPXMail 1.5 + Uebimiau 2.7.2). It has been build as a VMware Virtual Machine and you can download it from http://www.megaupload.com/?d=S1W7XCTE
I hope it can join to the TurnKey Virtual Appliance's family.