These are my all time favourites:
Black Sun Empire - extraction + Pendulum - Blood Sugar 2007 (the guitar riff after the break) + Telekinesis & Kinetic - Lithium
Black Sun Empire - Inpeak + Loki - Dreamweaver
Telekinesis - Bad Virus + Dose - Raiders then switching Bad Virus with Set it Off (I actually forgot the artist) cleverly using the vocals in Set it off.
then when the next vocals hit in 32 beats switch Raiders with Proktah - Punchbag (the intro) and then when Punchbag drops slowly fade in Neonlight - The Frozen Tape and fade Punchbag at the right moment.
This last one sounds so freakin awesome, bit more than a double drop btw haha.