Here is a list of my Macs (and what they are doing currently):
Macintosh IIcx In storage, has System 7.0.1 on it (the last I recall). It has 8 MB of RAM, an 80 MB hard drive and an MC68030 processor running at 16 MHz (along with a MC68882 floating point unit).
Macintosh IIci Running with System 7.5.5 and has an MC68040 upgrade card (running at 25 MHz) in it. It is currently in storage.
Macintosh IIsi In storage. It has 5 MB of RAM, a 50 MB hard drive and an MC68030 processor running at 20 MHz.
Macintosh IIvx In storage. It has an MC68030 processor running at 16 MHz (along with a MC68882 floating point unit), but beyond that I haven't fired it up to see anything else about it.
Macintosh LC II In storage. Haven't run it either.
Macintosh Quadra 700 Has A/UX 3.0.1 installed, is part of my main set of systems, but doesn't see much action (mainly used for pre Mac OS 8 apps). It has 20 MB of RAM, a 500 MB hard drive and an MC68040 processor running at 25 Mhz.
Macintosh Quadra 950 One of my favorite systems, it has three 21"
monitors attached, a CD burner, a 9 GB hard drive and has been upgraded with a PowerPC 601 upgrade card at 66 MHz with 1 MB of L2 and 136 MB of RAM. It is one of my more active systems. Currently running Mac OS 8.1.
Power Macintosh 7100 Not currently in use, this one was replaced by my 8100. It has a G3/266 upgrade with 1 MB of L2 installed.
Power Macintosh 8100av My main old Mac OS system (running Mac OS 8.6. It has two Apple 16" displays attached (one via the AV card, and a second via a 24 bit Nubus card), a G3/500 upgrade with 1 MB of L2 and 208 MB of RAM. It is connected to a scanner and a ZIP drive.
Power Macintosh 7500 One of my Rhapsody systems, this system is running Mac OS X Server 1.2 (Rhapsody 5.6) and is currently acting as a server (it has been replaced as my main Rhapsody workstation). It has 128 MB of RAM, a 9 GB hard drive, a PowerPC 604e at 210MHz with 256k of L2 and I maxed out the onboard video to 4 MB.
Power Macintosh 8500 In storage (mainly a parts system).
Power Macintosh 8600 My main Rhapsody system. This system is running Mac OS X Server 1.2v3 (Rhapsody 5.6) and is (now) where I spend most of my time while using Rhapsody. It has two 17" displays running off two ixMicro TwinTurbo 128M video cards (8 MB VRAM each). It has 416 MB of RAM, a 9 GB hard drive and a PowerPC 604ev at 300 MHz with 1 MB of L2 cache.
iMac 350 This system is currently running Mac OS X v10.2.8. It has 512 MB of RAM and a 30 GB hard drive. It serves as my back up Mac OS X system, my iTunes stereo (it is connected to an equalizer and some nice speakers), my gaming system, and the print server for my network.
PowerBook Duo 280 In storage. This system has 12 MB of RAM and an MC68LC040 processor running at 33 MHz. The hard drive died, so it is waiting for a replacement.
PowerBook Duo 2300c This system is currently running Mac OS 8.6 and is my main school system. I maxed out the RAM to 56 MB. It has a 1.2 GB drive and a PowerPC 603e at 100 Mhz. I have a full suite of apps on it but it's main reason for being used is that I can run both Theorist and Mathematica on it while at the library.
PowerBook G3 Wallstreet This is my primary system (I'm typing this out on it right now). It is currently running Mac OS X v10.2.6, has 512 MB of RAM, an 8 GB hard drive and 4 GB drive (in one of the expansion bays), a G4 upgrade at 500 MHz with 1 MB of L2 and the CD-ROM drive has been replaced with a CDRW drive (other expansion bay).
PowerBook G3 Pismo This system is running Mac OS X v10.3.9. It is my wife's system. it has 384 MB of RAM, a 10 GB hard drive, a G3 running at 400 Mhz and a DVD-ROM drive.
Non-Apple systems running Apple operating systems:
IBM ThinkPad 760 ED This is my main mobile system (my Wallstreet rarely leaves home). It is running Rhapsody 5.1 on a 6 GB drive and OPENSTEP 4.2 on a 2 GB drive. I only use the OPENSTEP drive while at school, most of the time it is running in Rhapsody as that is where all my work related documents are. It has 80 MB of RAM, 2 MB of VRAM and a Pentium processor running at 133 MHz with 256k of L2 cache.
PowerTower Pro 225 This system is currently in storage, but I was running Mac OS X Server 1.0.2 on it (Rhapsody 5.5) for a while. It has a 2 GB drive, no RAM right now, and has a PowerPC 604e processor running at 225 Mhz.
DEC Celebris XL5133 This was (long ago) my main Rhapsody workstation. It was running Rhapsody 5.1. It was originally running with two Pentium processors at 133 MHz, but I took it down to one Pentium processor at 166 MHz as Rhapsody 5.1 can only see one processor. This system is currently in storage.
I think that about covers it on the Apple related systems I own.