After going back and forth in the aforementioned thread, I compiled a reading list of Keep-related products. These include the original B2, TSR's Return to the Keep on the Borderlands, and two Kenzer products: Little Keep on the Borderlands and Frandor's Keep.
So far I've made a careful read-through of the original module, taking note of things that stood out for me. B2 is a pretty straightforward sandbox, but there are some hidden gems.
For starters, on p.6 (Background), the flavor text states:
Nice! So right away I'm thinking more Warhammer Fantasy Roleplay type chaos than just "That guy has a different alignment than me!" Imagine that beyond the Keep isn't just woods and hills with orcs and ogres, but a wasteland where savage men howl prayers to demons and the taint of corruption (mutation) is seen as a blessing from their wild gods. These tribes might be brought to heel by a warlord and forged into an army, fighting alongside the likes of orcs or worse. Maybe it's happened before?The Realm of mankind is narrow and constricted. Always the forces of Chaos press upon its borders, seeking to enslave its populace, rape its riches, and steal its treasures.
More to come, but that's something to chew on for now.