The current version is version 1.7b
It can be downloaded here:
Download Flexitris

For information as to what has changed, either check the readme.txt file in the download, or check the Revision History page
This is an alpha version, so it's got bugs. If you find one, report it on the issue tracker (or let me know). Also it is going to expire. If it does, come back here for the latest version.