[Prime8]

1) Jacks - Club, AIM Anthem, that new Guru song Jai whatever. I'm worse on my left hand.
2) One handed trills - Blooddrunk and FOTB. I'm worse on my right hand.
3) Chains - a bunch of songs. The worse though is when it's something like 24/2/24/4 or any combination of the sort. Basically when it's alternating on one hand it's a bitch.
4) I don't know if there is a name for them, but Scythe of 13 is the perfect example. When you are doing consecutive jumps, but throw in a note inbetween (like 8th note jumps with 16th singles in the middle). It's especially hard when it's not a one-handed jump.