JEvents 2.0 Beta12 is now available from the club download area - this version is designed to be compatible with Joomla 1.5 and Joomla 1.6. Also JEvents 1.5.5d has been released which fixes problems with CSV imports) - this will probably be the last release of 1.5.5.
This is a beta release but is getting pretty stable and we are now only seeing minor bug reports.