I really enjoy the Pimsleur method, listening to an audio lesson once a day for 30 minutes. The hardest part here is finding that 30 minutes each day to really pay attention to the lesson, and resisting the urge to do more than one lesson at a time when you do find the time so that the Pimsleur “method” can really apply.
I find that through the Pimsleur method I retain information the best. Where I still might have to think to recall a word I learned in another method, anything that I learned through Pimsleur comes instantly to mind. Its not my favorite method of learning, but its the one that works the best for me so far.