1. A little known Eastern European clone of ZX Spectrum
2. 1995 - Jumped to a 486/100, 4 Mb RAM, 850 Mb WD, 1 Mb S3 Trio32 video card, 14" colour DAEWOO, then in '96 added an extra 4 Mb SIMM and my first soundcard, SB Pro compatible.
3. 1997 - Pentium 133, some VIA VPX mobo, 16 then 32 Mb SDRAM, 1.7 Gb IBM, another S3 (this time a 2 Mb Trio64V+)
4. 1998-99 - sold the P133, got another 486/100
5. 2000 - Compaq Prosignia 300, P90, 16 then 48 Mb RAM, 2 Gb SCSI, my first CD-ROM (ACER 56x), my first 3d card (nVidia RIVA 128).... This was sweet... It beat the crap out of a K6/200 with a Matrox Millenium, in a certain 3d videogame.
6. 2001 - ECS Intel 430 TX mobo, various CPU's (133-233), 32-96 Mb RAM, 4-20-40 Gb HDD's, that RIVA 128, and a combo of soundcards (Yamaha SW20 PC, 2 Mb ROM, General Midi compatible and a Gravis Ultrasound ACE, 1 Mb RAM).
7. ?2002? - ECS mobo fried, so I used a spare 486/66

; worse than my first 486...
8. 2002 - Pentium III 450, on some cheepoo PCChips mobo, 96 Mb SDRAM, 40 Gb Maxtor, still with the RIVA 128 (PCI), onboard SoundPro aka CMI 8330, later a 4ch Sb Live!, 52x ASUS CD-ROM.
9. 2003 - Celeron 600 FCPGA, Gigabyte sk370, then ASUS sk370 mobos (both with VIA 694x chipset), upto 192 Mb SDRAM, 40 Gb Maxtor, AGP graphic cards: 8 Mb ATI RageIIc, 16 Mb ATI Rage 128, 32 Mb Leadtek S325 TNT2 M64; kept the SB Live! and the ASUS CD-ROM.
Man, that Celeron could overclock... Most of the time it was running at 750 or 900 MHz; maxed at 945, but for stability reasons I kept it at 900.
10. 2004 - Celeron 1200, MSI Intel 815 mobo, 256 Mb SDRAM, 40 Gb Maxtor, Gigabyte ATI Radeon 9250 128 Mb, SB Live!, BENQ DVD-Writer - got this one for playing Star Wars KotOR and Gothic, my previuos rig was not up to it.
11. 2005 - sk754 Sempron 2600+, ASUS VIA K8T800 mobo, 256 then 2x256 Mb DDRAM400, GeForce 6200 128 Mb, 80 Gb WD then 250 Gb Maxtor SATA II, NEC DVD-Writer.
12. 2007 - My actual rig, Athlon x2 4200+, ASRock nVidia 630a+GF7050 mobo, 2 Gb DDR II Kingston, 250 Gb Seagate, ASUS case; a year ago I got an ASUS ATI HD3650, and this year a 750 Mb Seagate and a 22" wide monitor. Kept the NEC writer; even it is old, it works perfectly; maybe I'll get a brand new ASUS SATA.
13? - dunno... plans for the future include a 5.1 sound system instead of my 12yrs old stereo speakers; did not changed them because they sound good and have more than an oomph when it comes to raw power; some faster videocard that will go along nicely with my 1680x1050 monitor; maybe 2 more Gb of RAM. If I look for a brand new CPU+mobo combo, the LPT port is a must; AFAIK few new mobos still have it.