All right, I have a question about creating a world and populating it with appropriate monsters, etc.
I created a world a little while back, loosely based off of the world found in Michael Stackpole's "A Hero Born". Did the timeline, created the history, fractional events, etc. Mapped all the major topographical features, then populated it on a semi random basis (Most of this from the World Builders Guide), and ran it past a power gamer friend of mine, who absolutely picked it apart. "This monster was in Dragon #242, and wouldn't appear here with this other monster from MMII, and this monster was in MMI and doesn't appear in the 3.5 world", etc etc.
For a nascent DM, it was rather disheartening and intimidating. However, looking at some other worlds on the 'net, it appears that the license is pretty much whatever you want to do.
What's the correct or accepted way to populate a world without continuity issues for those that would know? What's the worst that happens if you mix monsters from various editions (2e, 3, 3.5, etc) into one world?