There are a a few I've been following for a while.
In MotoGP I tend to follow the Honda riders so this year: Pedrosa, Marquez, Bautista, Bradl and Aussie Bryan Staring.
In Moto2 I've followed Ant West, Pol Espargaro, Thomas Luthi, Scott Redding.
In Moto3 I like Jack Miller and Arthur Sissis of course.
Redbull Rookies: Young Olly Simpson, this kid is very confident and very talented. He was interviewed with Mick Doohan at Phillip Island last year and when asked did he want to be the next Mick Doohan he said 'No I want to be the next Olly Simpson'. Needless to say Mick was impressed by the young fellas ambition and reckoned he'd go far.