TeamCity 6.0 (Eluru) EAP
Welcome to the cutting edge
Eluru is a codename for the TeamCity 6 version.
Current build: TeamCity 6.0 RC1 build 15673 released November 12, 2010
This version of TeamCity contains new features, improvements and multiple bug fixes comparing to TeamCity 5.1.x
Please back up your data (from administration UI or manually, backup explained) before upgrade!
You also might want to install the EAP version as a trial server.
Newer TeamCity versions usually adjust the data structure and you will not be able to return to using older TeamCity versions once the data is upgraded.