Probably What Happens Now? - Porcupine Tree.
...and the song Deadwing by PT as well.
Oooh and Hyperdrive! by the Devin Townsend Project
Also Al The Killer - Coheed and Cambria is, well... killer!
Mindscan IV: Welcome - District 97 is absolutely incredible too.
And the last "best song(s) ever" from me shall be Black Light Machine - Frost*
Ok, I lied. One more, Jeff Becks - There's No Other Me. Joss Stone is one of my favorite singers by far.
Cassandra Gemini and Eriatarka- The Mars Volta.
Alright I'm done. For now.