Great article about the relationship between Lucas and Spielberg. Money quote:

And so Lucas has been drawn back to Star Wars with an air of glum fatalism, while Spielberg puts on ever more ambidextrous displays of reach and range. Lucas may well win the box-office battle this summer, but Spielberg looks like he's won the war.

I guess they can both live in harmony together knowing that each have their little pet projects that aren't all that good. Lucas has his Star Wars prequals and Spielberg has his Jurassic Park triology.