Hmm. I'm starting to think it may be time to lighten the load.
The first item on the list is my SE/30 with 128 MB RAM, Micron xCeed Color Display Adapter, and ImageWriter II printer. I bought it as soon as it was introduced, and it's the first personal computer I ever owned. Fifteen years or more ago, I gave it to a friend who wanted a computer for his young son to use. When I gave it to him, it had 8 MB of RAM, a 40 GB drive, and no other upgrades. A few years ago, he returned it to me with an RGB display and adapter, and a 120 MB hard drive.

Thanks to a generous donation from a Nekochan member, I later was able to max out the RAM. I still fire it up now and then, and I doubt I ever will part with it. Considering the time it was released and the work I did with it, I rate this as the best non-SGI computer I've ever owned.
Unless otherwise noted, all of these are alive and well:
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The aforementioned SE/30
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PowerBook Duo 270c - includes interesting stuff like Aldus Pagemaker and Aldus Persuasion
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PowerBook Duo 2300
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Duo Dock II
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PowerBook 1400cs - Upgraded with 40 MB RAM, G3 CPU, external display adapter, Ethernet PCMCIA card, and swappable ZIP/CD-ROM drives. This was my daily driver for quite a few years.
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PowerBook3,1 - (G3 Firewire/Pismo) upgraded with ZIP drive.
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PowerBook6,8 - G4 12" 1.5 GHz - A total workhorse. After my SE/30, I consider this to be the next best computer I've ever owned.
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PowerBook5,7 - G4 17" 1.67 GHz
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iBook G4 - 1.42 GHz (PowerBook6,7) - doesn't boot; bad analog board
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MacBookPro2,2 - 15" Late 2006, 2.3 GHz Core 2 Duo - Until recently, when the GPU started to fail, this was my daily driver. Currently disassembled. I'm trying to decide whether to part it out or to try to repair it. It ran Snow Leopard like a champ.
Oh, yes, and a Newton MessagePad 130!
For current, daily use:
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Macmini1,1 - 1.83 GHz Core Duo, upgraded to 500 GB drive and 2 GB RAM. Runs some databases for a local charity I'm involved with.
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MacBookPro7,1 - 13" Mid-2010, 2.66 GHz Core 2 Duo, upgraded to 16 GB RAM and 1 TB Samsung 850 EVO SSD. This is my current "personal" machine.
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MacBookPro9,2 - 13" Mid-2012, 2.5 GHz Core i5, upgraded to 16 GB RAM and 1 TB Samsung 850 EVO SSD. This is my current "business" machine.
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iPhone 4S (likely to be upgraded in a month or so, pending Apple's March product announcements)