Is just that you forgot the password? Have you tried clicking the "Lost your password?" link?
If for some reason you can't get your password sent to you, you can always use phpmyadmin, go into the mysql database for this blog, and change the user/pass there. However, backup your database before doing any of that
Here's a link for you:
http://codex.wordpress.org/Resetting...ugh_phpMyAdmin