I’ve fought B3/Angstrom into submission over the past few weeks, and have been writing down everything I did. Perhaps parts of it will be of some use to some of you: www.cowsheep.net/articles?series=B3W
I’ve got several embedded interfaces up and running too (UART, I2C, GPIO, AIN) and am currently pulling my notes together into articles for these too. I’ll post them when they’re ready.
Best o’ luck!