As someone who is in a group doing all the adventure paths as they come out (though we've fallen behind on RotRL due to people thinking college educations are necessary) I'd like to say I love tie-ins between the APs.
ooh, ooh, me too.
For example, one of my players is running a cleric of Pharasma who lost his memory and was brought up by the priests (I know, kind of cheesy). Anyway, I made him Alek Vancaskerkin, brother to Orik and Verik and son of Saul. He was party to the arrest of Verik in Edge of Anarchy, but he's looking for an opportunity to travel to Riddleport to meet with his dad ...
I also love the return of Shalelu in Second Darkness. My gaming group all still remember her fondly, and she is brought up regularly in conversation.
O