Ninjawords: do it quick, do it fast. The zippy online dictionary.

Ninjawords's tagline is "A really fast dictionary... fast like a ninja." Unlike other online dictionaries where you have to wait for all the various elements to load (hey, I'm living where affordable DSL has speeds up to 512 kbps only) Ninjawords loads really fast. That's because Ninjawords doesn't have the extra baggage, extra text, and extra graphics that most of these online dictionaries have. It also searches terms pretty quickly. Again, it doesn't have the bells and whistles like most but it does the job. I'm bookmarking this website for fast and easy reference.