CMU Print Setup.app

Want to know how it's done? Want to manually set it up yourself? Instructions here.
I also have a WebISO autocomplete bookmarklet. After you install it (drag the link to your bookmarks bar) just click it when on a WebISO login page.
After initial setup it will remember your password. If you ever have problems logging in just click the bookmarklet again and it will reconfigure. Tested: Safari 4 and Firefox 3.6