Wow. I don't think I can remember everything and some dates may be off, but here it goes. What I still have is in bold face.
Born 1976
1987: Commodore 16 (used to program noise sequences in BASIC)
1988: Yamaha PSS-20 (miss it)
1989: Atari 65XE (more BASIC programming: videogame music, additive synth, etc)
1990: Casio SK-5, experiments with overdubbing between two cassette decks
1991: Cheap DJ mixer and turntable, acoustic drum kit
1993: Casio CA-100
1995: Multimedia kit for my PC -> discovered music software
1996: FastTracker II, Rubberduck
1997: Hammerhead
1999: Zoom RhythmTrack ST-234 (first piece of hardware - sold it around 2005, but recently bought another one)
1999: Korg X5D (first synth - sold it around 2002)
2000: Zoom SampleTrak ST-224 (still have it), Juno-106, Emu ESI-2000
2001: Moog Prodigy, Ensoniq SQ-80, Korg MS2000R, Korg Wavestation SR, Roland SPD-11
2002: Akai S2800, Yamaha VL-70m, Yamaha DX-200, Yamaha P80, Korg Poly-800, Korg ER-1 (still have it)
2003: Nord Micromodular (sold it, but just bought another one), Emu Proteus 2/XR, Fender Rhodes 73, Korg EX-800
2004: Ensoniq ESQ-1
2005: Started a dotcom modular, Waldorf XT
2006: Tried VSTi's: VAZ Plus 2 (still use it), Wusikstation, Cameleon 5000, z3ta+, QuadraSID, PlastiCZ
2006: Bought a second MS2000R (it was only $100), Yamaha SU-10, Moog Etherwave Theremin
2007: More softies: Imposcar, Oddity, Minimonsta, M-Tron (never used, except for M-Tron), Nord G2 expanded (still have it)
2008: Added another dotcom cabinet, Boss DR-770, Emu MP-7, Atomo Mochika, Nintendo DS w/ Korg DS-10 (still have it)
2009: Nord Lead 3, Prophet 08, Elektron Machinedrum UW, Yamaha FS1R, Korg Wavestation A/D, Oberheim Matrix 6R
2010: Added more modular stuff, Korg ES-1, Akai MPC-500, Yamaha EX5R, Korg EA-1 (still have it), Korg Monotron (still have it)
2011: Started an eurorack modular, Hard Mod Wild Semimodular
2012: Added more modular stuff, Hard Mod Analog Ribbon Synth, Akai XR-20 (still have it)
2013: Finished both (MU and eurorack) modulars, Rebought Zoom SampleTrak and bought another one (I have two now)
2014: Rebought Zoom RhythmTrak RT-234 and Nord Micromodular
Plans for 2014-2015: re-buy some stuff I miss: Korg MS2000R, Emu sampler, Waldorf XT, Moog monosynth, and more drum machines.
I also have a few music apps for the iPad and iPod Touch, but I didn't include those.