I completed three Spanish lessons from Mango: Learning Language Online. I actually had fun. I took Spanish about 15 years ago! I actually remembered some. I wish Mango had Finnish lessons, which was the first language I spoke. My parents were born in Finland, and I was born in beautiful Berkeley, CA.
Learning a language from the computer is easier compared to listening to a cd and holding a work book. With the computer, you control the visuals and auditory with one mouse click. With a workbook and cd, you have to hold the book plus worry about pushing the pause button on a cd player. I also like the "flash card" approach on the computer when learning a language.