RepRap Family Tree
Description
reprap.org/wiki/RepRap_Family_Tree
It's a visualization of the evolution of the reprap and some other 3d-printers over time (with 150+ projects now, and updated every 2-3 months).
"In the core team, we see what I will call a punctuated animal model of evolution while the larger reprap community is a very vibrant bacterial model." -Forrest Higgs (16-01-2009), about the evolution model of the reprap.
Why oshw is great ? Because it's alive muahaha !
[01/11/2011] update 3.2
[07/01/2012] update 3.3
[14/04/2012] update 4.0
[29/10/2012] Now on github ! github.com/EmmanuelG/OpenHardwarePhylogenetics/tree/master/RepRap%20Family%20Tree
Instructions
2) Look at what have been done in only some years.
3) Make the futur.
But remember : never expose a printer to bright lights (especially sunlight, which will kill it); never get it wet; and never feed it after midnight ;P
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After aggregating all that, I hesitated to organize the printers by how their platform move (only Z for most of the cubic shapes, YZ for Up/Orca/Mosaic, XY for makerbot and some repstrap, only Y for the mendel childs; plus a special category fore the delta, rotating or arm based concept).
I wonder if there is a preferable strategy... (Y and YZ seems good for the external volume)
So why is the ultimaker derived from Darwin? AFAIK the only relation is that they first broke their teeth on building a Darwin, but their design has none of it's features. Their cartesian gantry owes some tribute to fab in a box (and probably some others that use a similar mechanism).
Wooo! the Type A Mk 1 is there!
Its spirtually an ultimaker child... but I'd not bother changing that till the damn thing is finished.
Ooh yay, IKBot got a mention. I really need to work on that some more.
License

What would be necessary to do something similar for the Firmwares, and the electronics? It would be really useful
It would be easier for the firmware/electronics, since they have less variations than repraps :)
I may try to do that when I'll have some time to look for the infos (mostly release dates), and started to note them on the wiki page (was also thinking to do that for the evolution of the extruders ^^).