Yes hardly 15 days ago Wordpress 2.6 was launched !! I upgraded to it. Working fine for me. I didn’t notice any flaws but still tester are the great people. they do great things with there box.
Few Major Issues observerd :

• Sporadic timeout /wp-includes/gettext.php
• Category/tag URL changed if the permalink structure has static strings
• Publishing directly sets wrong date on ‘post_date_gmt’

55+ more issues where solved in the new one launched yesterday !! Proud to say I upgraded to Wordpress2.6.1