Dividend growth stocks, like PG, MCD, PEP, KO, LMT, KMB, WM, etc. They don't swing too wildly with the market (they even stayed steady during the recent down/upswings), and they generally increase their dividends at a faster rate than inflation. It's a sort of "get rich slowly" scheme, but it's fun to see a growing share of my expenses being handled by passive income.