WordPress 2.6.1  has been released and it is a very minor release. Not security flaws has been found and hence WordPress 2.6.1 is not a security fix so if you are comfortable with WordPress 2.6 like me, you don’t have to upgrade.
2.6.1 offers several improvements for international users. Styling of the admin for right-to-left languages is much improved thanks to the efforts of the Farsi and Hebrew translation teams, and a mysterious gettext bug caused by certain PHP configurations is now fixed. For IIS users, 2.6.1 fixes several permalink problems. Image insertion problems in the Press This feature experienced by IE users are also fixed. Of note to everyone is a fix for a performance bug in the admin where those with a lot of plugins would experience slowness on some pages.
I am so looking forward to WordPress 2.7 as lots of features which are available as plugin will be built into the core.
*UPDATE* I decided to upgrade to stopped the nagging upgrading message to appear.