So I've broken it down like this -
Party, people and events shots are going on picasa. It's easier for people to browse and whatnot.
Arty, landscape-y, abstract-y pics will go on flickr. Because they look better there. And context is less of an issue. There may still be people shots, but probably not portraits. Unless they're particularly arty, landscape-y, abstract-y or some combination of the three.
I'm updating both sites today with shots of France and the wedding I attended. Have a look. The flickr page allows you to comment, so please feel free.
Preferably more frequently than you do here.