Listed some of my collection on the 'new members' bit of the forum, but totally forgot to put loads of stuff. Here's my current, mostly vintage Apple (in volume, at least, I'd forgotten how huge CRT's are!), collection:
MacBook Pro (mid-2012 13-inch), my 'daily driver' which I love!
Commodore 64C, with the Datasette, joystick and a bunch of games
iMac G3 "Bondi Blue" revision A, in the original box with every manual. Just like it was new in 1998!
iMac G3 "Blue Dalmatian" used for Spotify, the speakers are great
iBook G3, upgraded with WiFi, 640MB memory
Nintendo Game Boy Colour, in blue
Nintendo Game Boy Pocket, a custom-made transparent/orange combination (only one like it in the world that I know of, refurbished and like new!)
Nintendo DS Lite, in red
PowerMac G4, my next 'project'
Nintendo DSi XL, in black/blue
A Raspberry Pi (does this count? It does play retro games)
As well as a load of old (mostly Apple) manuals, keyboards, mice, power adapters, spare bits and etc.
Loads of games, software and manuals for all of the above^ a combo of discs, floppies, cartridges, books and files on external HDDs and USB drives
In the past, I've also owned (and regrettably sold, thrown away or exchanged):
Sega Mega Drive II
Power Macintosh G3 (blue and white) - refurbished and sold to another collector
A few other Nintendo DS'es (a silver DS lite, black DS lite, and a red/brown DSi XL)
Nintendo Game Boy, the original beige 'brick' - traded for my custom pocket
Microsoft Xbox (the original)
Nintendo GameCube, a rarer pearl-coloured one
Sony PlayStation 2, which died on me after almost 10 years of service!
Sony PSP 1000 (though come to think of it, it might be in a drawer somewhere)
I know my "retro" collection is actually fairly modern, but I like to have machines that I can still use on a day-to-day basis. I'm only just realising how much Apple tat I've ended up owning, but I just love the stuff they were making in the late 90's - early 2000's era; when they were still innovating and not just copying other companies.
In the future, I'd love to come across an Apple II (especially a IIGS, my favourite computer); a 'compact Mac' from the 80's or early 90's; one of the swivel-screened iMac G4's; and an old tabletop arcade machine (like an old Space Invaders machine). That's if I find any space for them!