Looks like Lion's got some nice stuff, as well as more eye-candy, but I didn't see anything that screamed "Buy Me..." to me, anyhow; my attitude may change over time, but Snow Leopard satisfies my minimal requirements for the moment.
What I did see is that I'll have to do plenty of de-configuring on my first launch.
The new Great Equalizer is the SEND button.
In Memory of Harv: Those who can make you believe absurdities can make you commit atrocities. ~Voltaire