On my iPod at the moment...
Amplifier
Arena – all the studio albums
Audioslave – Out of Exile
Ayreon – The Human Equation
Deadsoul Tribe – A Murder of Crows
Dream Theater – SfaM, Six Degrees, ToT and Octavarium
Evergrey – The Inner Circle
The Flower Kings – Paradox Hotel
IQ – Subterranea, The Seventh House and Dark Matter
Jadis – More Than Meets The Eye
Joe Satriani – various bits and pieces from several albums
Lacuna Coil – Comalies and Karmacode
Marillion - Marbles
Nightwish – Best of
Opeth – Ghost Reveries
Pain of Salvation – Remedy Lane
Pallas – The Dreams of Men
Pearl Jam - various bits and pieces from several albums
Pure Reason Revolution – The Dark Third
Queensryche – O:M I and II
Rush – my all time favourite albums, Moving Pictures and Permanent Waves
Spock's Beard – V, The Light and Snow
Symphony X – all the studio albums
The Tangent – A Place In the Queue and The World That We Drive Through
Threshold - Subsurface
Tiles – Window Dressing
Vanden Plas – Christ.0
Yes – The Yes Album, Close To The Edge, Relayer, Going For The One
It's only a 4gb iPod so these change frequently :D :D
Get some more Opeth and the Riverside added mate and you are cooking on gas *horns*
Well Second Life Syndrome is on there now ;D