The Asterisk development team has released versions 1.6.0-beta2 and and 1.4.18-rc2.
The new beta for 1.6 is available for download from http://downloads.digium.com/.
The release candidate for 1.4.18 is only available via svn. It is available for anyone that would like to help test 1.4.18 over the next couple of days before it gets officially released.
To download the 1.4.18 release candidate:
$ svn co http://svn.digium.com/svn/asterisk/tags/1.4.18 1.4.18-rc2
To make a tarball out of the previous checkout, do:
$ svn export http://svn.digium.com/svn/asterisk/tags/1.4.18 asterisk-1.4.18-rc2
$ tar -czvf asterisk-1.4.18-rc2.tar.gz asterisk-1.4.18-rc2/
Please report any issues to http://bugs.digium.com/.
Thank you for your support!