Seriously? A splash screen?
The current BitCoin client is an awesome proof-of-concept, and a decent first pass to get the network "into beta".
However, I think that "fixing" the client with things like a splash screen is wasted effort. Let's put our time and energy into a portable core BitCoin engine, and define a way of creating LOTS of different clients that interface into it.
But, you know... adding a splash screen is probably pretty easy...
