If your ulcer (or common sense) requires some fixed income in your portfolio, check out the iShares Lehman 1-3 year Treasury bond (SHY). Especially with the interest rate uncertainty out there, fixed income could be a wise choice.
Get Some Help
ETFs have been around for a while now, so there's a ton of info to help you make some good choices. But here are two good places to start.
Morningstar recently released its ETF 100: 2006 book, which details the top 100 ETFs available.
In addition, the company has created a "fair value measure" for each sector ETF. This is basically a report explaining why Morningstar feels each sector is either over or undervalued. For example, its analysts currently believe the real estate and energy sectors are overvalued, while the consumer products and financials sectors are undervalued. So now might be a good time to check out those sector ETFs.This measure will soon be available on the Morningstar Web site, so be on the lookout. You can also check out Fidelity's "Build an ETF Portfolio"