General info, amplification
  The band
  Electric strings
  Acoustic strings
  Percussion
  Piano
  Keyboards

Queen
  Smile
  Early shows I
  Early shows II
  Sheer Heart Attack
  A Night At The Opera
  Summer 1976
  A Day At The Races
  News Of The World
  Jazz
  Crazy tour
  The Game + Flash
  We Will Rock You
  Hot Space
  Montreux 1984
  The Works 1984
  The Works 1985
  Live Aid
  Montreux 1986
  Magic tour
  Freddie Mercury Tribute
  Queen + PR tour 2005
  Queen + PR tour 2006

Brian May
  Back To The Light
  Another World

Smile (pre-Queen period: 1968 - 1970)

Percussion

Roger had a Ludwig kit, which was the dream of any British drummer at the time. On the photo it looks quite big but perhaps that's an illusion :-)

Bass guitars

Tim had a Fender Jazz and he also apparently bought a Danelectro when he was asked to play bass for Smile (he's actually primarily a guitarist, and would have some nice Gibson LP's later on).

Guitars

Brian played the Red Special with two Vox Ac30 amplifiers, which he'd bought for 20 quid each in 1967 (more or less).