I just discovered the darndest thing today. I have always had a difficult time typing del.icio.us or script.aculo.us on the address bar because I could never pin point where the "." should go in the url.
Well, today, I said to hell with it and typed the whole word "delicious" instead of "del.icio.us" on the Firefox address bar. Guess what, it redirected me to the correct site. Seems to work on Internet Explorer too.