Too many to name, his music is absolutely awesome.
History is full of quality songs, all his singles he released I like, aswell as others that he didn't release that are on it. I haven't heard many from Blood on the Dancefloor or many of his older album stuff that weren't singles, i'll probably download them all in time.
Invincible wasn't bad, I bought it on the day it came out over here, You Rock My World was a ****ing brilliant song though, really really catchy.
If I had to pick a top 10 (sorry, 5 is leaving too many off
), off the top of my head i'd say: (in no order)
Black or White
Bad
Billie Jean
Wanna Be Startin Somethin
The Way You Make Me Feel
Stranger In Moscow
Smooth Criminal
Leave Me Alone
Don't Stop Til You Get Enough
You Are Not Alone