I don't know many songs. I can play all of The Trooper, but that one is fairly easy (but still a great song), most of Laid To Rest, the opening solo of One is really fun to play. Oh and Between The Hammer And The Anvil, and The Reckoning. Other than that, I just know riffs and solo's form different songs.
my most techincal song right now is prolly "remorse is for the dead" by lamb of god. i would say it was "laid to reset" but the intro riff and chorus riff sounds kinda sloppy. oh well, i'll keep workin on it, i'll get it soon!
Spawn of Possesion - Scorched is THE fastest song iv'e heard (310 BPM) and it's very technical, even the singer sings fast as hell also, Nile has some technical stuff like ''Papyrus Containing the Spell To Preserve It's Possessor Against Ataacks From He Who Is In The Water'', yes i know a hell of a title too XD