If you can find a Silverstone Berserker (it is mostly an OEM case now and not listed on the SST site anymore), it is completely toolless for the following parts:
- mobo
- two 5.25 half-height drives (e.g. opticals)
- two 3.5 x 1" hard drives
- one floppy-sized drive
- add on cards
- side doors
PSU requires screws - but I used thumbscrews with washers on mine.
There is room for many more drives, watercooling, etc., but those will need screws and/or adapters.
It has cages for up to four 80mm fans and you can add a 120mm in the front bottom using screws, rubber pins or plastic lock pins, but I'd want to cut out the grill plates as they are quite restrictive. I used a CoolerMaster 4-in-3 HD cage in the bottom bays which solved that problem, but I had to cut on it a bit too... See my review of my Berserker at
http://www.techimo.com/reviews/
I think some Thermaltake and/or Aspire cases have the snap-on mobo mounts too. And there are lots of cases with some toolless features like the Antecs, the Kingwin 424 series, the Evercase 42x2 series, etc...
.bh.