Scabe has quite some Jigglypuff experience so watch out..
And @ LzR:
DK: Get up in his face. He has better range so you have to. Get him to the air as much as you can, because Jiggs wins there. DK's bair can be a nuisance, but you can still beat him. You have a much overall better air game; DK's other aerials aren't difficult like bair. Be very wary of his dsmash, which comes out pretty fast. Remember the range and be defensive if you think he can hit you. Especially be careful with pound at high percents, as he can punish that oos with dsmash. Really though, against a good dk you need to not let them out zone you or you will be screwed. You also need to get agressive with kills (well I suppose you should with any MU) because DK can live very long with his weight + momentum cancel. I could be wrong about this, but iirc DK's shield is easy to poke, so Pound and Rollout are more useful. Rollout can be pretty useful for punishing any ending lag he gets, if you like to use it anways.
As for Pikachu and Samus, I haven't really played either, though you should ask KillerJawz about the latter, since he is experienced in that MU.
With Wario, there really isn't much to be said that wasn't in the MU thread. Fight him in the aerial x-axis as much as you can.