1982-1992: Pentax K1000 film SLR
1993-2001: Olympus 35mm P&S
2001-2004: Olympus C960Z (1 MP P&S)
2004-2009: Olympus C765UZ (4 MP superzoom P&S)
October 2009: bought Rebel T1i
March 2010: bought EOS 7D (sold T1i)
October 2010: bought EOS 5D Mark II
March 2012: preordered EOS 1D X
July 2012: received EOS 1D X (sold 5DII)
As for lenses...
that would take too long to chronicle.

Ok, I had a little time...
Oct 2009: bought EF-S 17-55mm f/2.8 IS and EF 85mm f/1.8
Dec 2009: bought EF 100mm f/2.8
L Macro IS *onset of L-disease
Jan 2010: bought EF-S 10-22mm f/3.5-4.5
bought EF 200mm f/2.8
L II (used)
Feb 2010: bought EF 300mm f/4
L IS (used)
Mar 2010: bought EF 1.4x II Extender (used)
bought EF 100-400mm (sold 300/4L IS)
Apr 2010: bought EF 70-200mm f/2.8
L IS II (sold 200/2.8L II)
May 2010: bought EF 24-105mm f/4
L IS (used)
June 2010: bought EF 85mm f/1.2
L II (sold 85/1.8 )
July 2010: bought EF 70-300mm f/4.5-5.6
DO IS (used)
Oct 2010: bought MP-E 65mm f/2.8 1-5x Macro (used)
bought EF 24-105mm f/4
L IS (with 5DII kit, sold used copy)
sold 70-300 DO
bought TS-E 24mm f/3.5
L II
Nov 2010: bought EF 16-35mm f/2.8
L II (sold EF-S 10-22mm)
Dec 2010: bought EF 35mm f/1.4
L bought EF 135mm f/2
LMay 2011: bought EF 2x II Extender (used)
Feb 2012: bought EF 28-300mm f/3.5-5.6
L IS (used)
Apr 2012: sold EF-S 17-55mm
July 2012: received EF 40mm f/2.8 'pancake'
Aug 2012: preordered EF 600mm f/4
L IS II
bought EF 1.4x III Extender (sold 1.4x II)
Oct 2012: received EF 600mm f/4
L IS II
bought EF 2x III Extender (sold 2x II)