I periodically get a bee in my bonnet about how sadly lapsed my French skills are, usually when we've been for a visit up north and I've been caught out at a cash register by a french speaking cashier. I tried podcasts and iTunes University and the BBC free language tutorials. Nothing quite hit what I needed.
The Mr. came across Duolingo a few months ago in his internet travels and pointed me to it. It's still in Beta, but you can request an account and it's free and really quite good! It's been amazing to me how much I actually remember and how quickly it comes back. I'm still much better at reading/listening I am at writing/speaking, but the Duolingo method feels sustainable so I think it will be a big help.