I have a diverse portfolio:
Cash savings
Individual stocks
Stock funds
Bond funds
Money market funds
Metals: Platinum, gold, silver
Different investments yield different returns at different times, hence the importance of diversity. Last year I did really well with my stocks, making as high as 80% return on my AirTran stock that year. This year my metal stocks, platinum especially, have done pretty well, enough to offset any losses elsewhere. And then there are my money market and bond funds which just always grow slowly and steadily.