The wp_users table lists the usernames and hashed passwords. There's no way to retrieve your password, but you can reset it: simply set the user_pass field for your user to the MD5'd value of your new password. You can do that pretty easily with phpMyAdmin, or just run the query:
Code:
UPDATE wp_users SET user_pass = MD5("your new password here") WHERE username = "admin"
(Where "admin" is the username. "admin" is the default account WP creates during the install.)