I've complied OpenEinstein 2007-07 build 48. Current as of today. You can download it below. It's about 1.8 megs, bzipped. It will expand into a 16 meg file.
Feel free to download the binary here. You'll need this file also: Einstein.rex. The last thing you need of course is a real Newton ROM, so please have that handy. Directions are in the manual-- it's worth the read if you are going to try and run this.
I'm still trying to figure the best way to make this run on the 770. I like killing the maemo_af_desktop, so that the OpenE isn't locked into it, but sometimes OpenE won't start. If someone has it going full screen on the 770, please add a comment for your exact startup line. I still haven't gotten it to go the full 800x480 on the 770.