It's pretty awesome that there are devs out there still working on getting all the latest Android builds working on the OG Droid. The venerable old girl is still kicking around, and now a pre-alpha build of Android 4.0.3 with CyanogenMod 9 is being worked on by a member of XDA. In fact, it's even available for download, and experimenters can get it, here. The video above was posted from a different XDA member, but shows off the OS running on the phone. There are still a lot of kinks to work out, and some of them are pretty important. The build is currently unable to connect to the external speakers or camera, and the screen rotation is off, amongst other issues.
Still, to get ICS jammed onto the OG Droid is pretty miraculous. It's like stuffing a Porsche 918 Spyder Hybrid engine into a Model-T Ford!