Apparently Walt's fake name 'Lambert' was Marie and Skyler's maiden names.
Oh, and the writing under the photo said (found a big pic of it):
EDIT: I'm sure everyone knows about these, but I just found them, and they're pretty cool:
EDIT 2: I was just reading the wiki, and apparently Tyrus was the guy who rang Hank and warned him about the Cousins. That doesn't really make any sense....