Of the 80%, it's about 45% in IRAs, 35% in post tax accounts. My company discontinued their 401k plan a while back, so I'm limited there.
For my retirement accounts (Vanguard), I started with a Target fund. Once I had enough to spread out to my own allocation, I went with 30% Total International Index, 30% Small Cap, 20% Value Index, and 20% S&P 500 index. Picked it out of a list of allocations thinking I could take on more risk, thus higher international and small caps.
The post tax accounts are all over the place. I've done ETFs, leveraged ETFs, and individual stocks. I even took a (tiny) gamble on Fannie Mae. Broke even there and realized it wasn't for me. Haven't fully run the numbers to see if it's worked better than an index fund. That's basically what's next on my list.