Oh hell, right now? Invest big time!
Oh hell, right now, I'd invest 1/3rd into stocks (there are some great buys out there), 1/3rd into select real estate and the other 1/3rd diversified over a few money market funds (awaiting better stock opportunities in the future).
I know a lot of people think that's "a lot of money," but it's not at all. But it's a great "investment start." Live thrifty, invest well, and you'll be just fine.
Even in these allegedly "hard times" I've only lost about 10% of my investments. I lost about 10% back through the 2003 bottom. In return, I've made about 50%, so I'm doing quite well over 10 years.
What I wouldn't give to have started out with $400,000! If I had that in my mid-'20s, it would easily let me retire early with about the $2.5M I figure I need to retire. $2.5M @ 4% APR = $100,000/year, the amount I believe I'll need to live on in 30 years to equal the $30,000/year I live on (with my wife) now.