The comments so far are espousing passive investment strategy and good asset allocation, which I agree with, but I was looking for something a little more concrete. So in effort to engender some discussion with hard %s, the following is where I am right now (excluding equity in primary residence). The accuracy (beyond decimal point) is certainly irrelevant, but it came right off a spreadsheet and I left it in because…
Think about it: if you told Andrew Carnegie you were putting "21.87%" of your money into "US Large Cap," he'd laugh his ass off. He'd ask why you knew, to four figures, what kind of stocks you were investing in, but didn't bother to talk about what they made, who ran them, or how much money they earned. He'd ask why you would prefer buying $100 million of cash flow for $2 billion rather than $1 billion, as an allocation based on market cap would have you do. Carnegie is a great example, because for a while he was purely an investor -- he had a diversified portfolio of stocks in companies whose management he knew personally, and he paid careful attention to their business performance and the dividends they paid, not their market price.
Don't do anything Carnegie, Morgan, or Rockefeller wouldn't recognize as an investment, and you should be okay.