In particular, I want to make an intense study of the bootrom code. I played with objdump to disassemble it, then did some searching and found that a user "Kongo" had already done some careful work along this line. My game would be to study this in detail and add notes and annotation. I have done this in the past for other processors and have found it to be extremely useful and instructive. Actually I have already began a bit of this and placed it here:
http://cholla.mmto.org/esp8266/bootrom/
I am busy on more.