Here's something handy: how about you can drag an object from your ineventory into an IM window (one on one IM only) and it'll offer it to that person? Much easier and quicker than opening up their profile or finding their calling card. Just a thought.
And also about inventory drops, can we have an confirm drop window (that can be turned off of course)? Sometimes I accidently drop the wrong object when I'm going too fast and it would be cool if I could say nevermind right before they get it... just a few thoughts.