As promised, Joomla! Development Team released Joomla! 1.5.17 today (April 27, 2010). The primary purpose is, of course, to fix the two major bugs introduced in version 1.5.16, but it also includes 2 new languages for installation, updates help sites list and patches an additional bug.
The full detail about this release can be found at its official announcement page. You can also see two download packages of Joomla! 1.5.17 there. One is for full installation, and the other for upgrade.