Visually indicate that the content is from Stack Overflow, Meta Stack Overflow, Server Fault, or Super User in some way. It doesn’t have to be obnoxious; a discreet text blurb is fine.
Hyperlink directly to the original question on the source site (e.g., http://stackoverflow.com/questions/12345)
Show the author names for every question and answer
Hyperlink each author name directly back to their user profile page on the source site (e.g., http://stackoverflow.com/users/12345/username)