Use my method. Start jamplay lesson, get bored 2/3 through lesson. Then go to youtube and find a lesson video on a song that is years past you level ability. Get frustrated when you can't do it and find a related video of a 15 year old playing it flawlessly. Then go to bed bitter and angry.
Really though Jamplay has a shitload of lessons that you would be paying 20-40 bucks an hour for and instead you are paying 19 a month.
There are a ton of other sites like it but it is a big one. It's flaw is not a lot of individual song lessons. They just don't want to mess with copyright issues I guess. But that is what JustinTV and Marty Schwartz youtube videos are for.