WordPress 2.7.1 is out. The release comes with 68 fixes.
For more info on the changes you look at the list for fixed tickets and the full change log.
Upgrade’s a breeze with the new auto upgrade function. If you get a timeout issue, try this fix. Increased my timeout to 120 and the upgrade completed successfully.
Alternatively, you could still upgrade the manual way by downloading WordPress and upgrading over ftp. If you need help refer to the manuals to install or upgrade.