Can't access wp-admin on my blog

Aargh! I don’t seem to be able to get past the wp-login.php page. It keeps redirecting to there.

I am logged in, and using the correct password, but I can’t get through to the admin pages.

I can post entries via ecto, too!

Update: ck has a fix: http://ckon.wordpress.com/2008/07/15/fix-for-wordpress-26-cant-login/