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Dividing the song into sections and doing mass repetition is the only thing that comes to mind.

if you have the song you're trying to memorize, then listen to that when you're out and about, maybe even on repeat. xp and yes, repetition. try focusing on the listening for the bass in the song, or the drums since bass and drums usually go together. pirate good luck. 3nodding

Identify the Riffs and Play them seperately, when you can play them all try and put them in order,
(i usually just look at the Chords and try to figure it out from ear)

A lot of the time in songs there is a lot of repetition of ideas, so its mostly organizing those ideas into the song's road map. Play through the song as a whole a few times, then identify those repetitions. Thats my advice.

Thats great advice. But not all peices can be tackeled this way. Lets say you have a classical peice you want to play, but you cant get it down. The best way to attempt a song thats to hard to handle, is to learn all of the sequences and repetitions in the songs. Then note the intervals in between the notes. If you take the peice one chunk at a time, you can eventually get it to a playing point. Then you take on the whole peice, and learn it in its entirty. This was tought to me by my major instructor.