I really can't recall any outstanding experiences, but I always do appreciate the drivers who move to another lane to accomodate me or just move as close to the left of their lane as possible when passing me. There are also those who pull in behind and follow me for about half a block before making their right turn (I call them stalkers cuz that's what it seems like they're doing). And even those who do bonehead maneuvers (like pulling the front of their car way into the bike lane) but sheepishly apologize by waving their hand and looking rather guilty is okay by me. At least they're owning up to their mistake.