Some older, some newer. All worthy of your time.
First off, one I stumbled on and used in my Stars Without Number campaign: Coins and Scrolls has a comprehensive - and often hilarious - d500 mutations random table.
|Image (cc) MassCreed|
Bastionland makes an excellent point about some important key questions, and their answers, around how easily we are able to pick up and play RPGs and game settings.
Another great random table - there are never enough tables - this time Graphite Prime asks "what happened in that town?"
The Grave Robber's Guide asks "How can games teach themselves", which has started off an interesting train of thought in my mind...
I stumbled upon an interesting experiment in reusable dungeons over at Lapidary Ossuary which looks at a problem I am mulling but from the other side.
Papers & Pencils has a whopping SIX d100 dungeon-creation tables up - the rest are linked from this one.