I like the Pimsleur courses. Since they are audio only, you can use them while you're doing other things, like jogging or driving (if there isn't too much traffic). So learning doesn't take any extra time out of your day. They will teach you good pronunciation, since you are hearing the language constantly. But you don't learn much grammar or writing. And as with most courses, they only give you a start in the language. You'll still need to learn a lot more.

well, it could be useful especially for pronunciation but I think that doing exercises (I mean practicing with written exercises and compositions) and reading rules from a book it's an important part in learning a language... my opinion... =)

maybe did you mean Pimsleur package language? audio-only language course?