I read "The Search for God and Guinness", fun read even if you aren't religious ( I am not ):

http://www.scribd.com/doc/20861910/The-Search-for-God-and-Gu...

Just saw this, I haven't given it a listen yer, but I do intend to. Looks fun:

http://www.thedigitalhubelevate.com/memoirs_of_guinness

Also Guinness makes their employment archives available to descendents of past workers, which is pretty neat:

http://www.guinness-storehouse.com/en/somehistory.aspx