T23 not in use, toying with once in a while.
A31p occasionally used for repair info using serial port.
Two T410 one integrated, one GPU.
One T420 for heavy work and for travelling while visiting friend (in same city).
T60 14.1" as toy. LOL.
Sony VIAO 13.3" C2D 2.5GHz 800fsb with better cooling design both fan and hestsink. (cooling designs; there were 3 revisions).
Toshiba 15.6" 2.93 fsb1066 with DDR2 even equipped with 4500MHD.

Dell Studio 1558, just swapped parts around from T410 for i7 CPU and ram since this is one with better GPU (HD5470) and improved cooling mod. NO pad for GPU, just copper shim.
R42 modded using T42 ATI 9600 motherboard, 2GHz and R52 long heatsink.
R52 bios modded and fully upgraded.
I just swapped my years (7 yr) of use, fully upgraded optiplex 780 tower for HP z220 barebone for good price. Machine sports nice i5-3570 which is so sweet to use now with speedy HD and decent "high end" GPU waiting to use. Pending CPU swap to xeon and eventually get ECC memory then buy good new HD, hey better than SSD in size and cost wise is to get HGST/WD gold 10TB helium w/ 256MB buffer, hey the z220 is a reason to get as they are one of them to get UEFI for first time which is a requirement to handle properly booting from large HD. They are not that bad even some think expensive but worth for long term use from ebay. z220 is equipped with 400W 90% efficiency. I plan to swap 600W PSU 90% efficiency from a z420 one day. That Optiplex 780 came together as parts then upgraded over the years including XP, then 7 Pro finally 10 Pro. That 780 replaced unreliable machine socket A 462 Athlon barton thanks to VIA chipset. MAD.
Also 3 more Dells optiplexes: USFF and SFF 755, DT 760 and fire-breathing SFF GX620 3.8GHz.
One USFF HP DC7900 and HP ultra slim 8200 with i5.
Some were recycle finds and some were sent to me from friends.
Retired:
R40 had looong life hand me downs from many owners then to me then gave it to friend for several years then back to me. Ran into performance limitations and not worth fussing with more upgrades.
A21m due to dead battery kept CPU performance down.
I do depend and collect computers to entertain myself and talk online since I am deaf and not much to do at this moment.

Cheers, thinkpadcollection