For many -- if not most -- of us, the money we've socked away in our employer-sponsored retirement plan represents the biggest portion of our nest eggs. Trouble is, too few of us take maximum advantage of our plans. And even those who do take advantage of them might not be putting money to work in other investment vehicles that also provide tax-favored earnings growth.

Some folks, however -- perhaps even your coworker stationed in the next cube -- know exactly what it takes to get the job done.

Take the money and run
If your company matches retirement-plan contributions up to a certain level, make sure to kick in at least as much as they'll match.

Even if your company's plan isn't the greatest in the world, it's hard to beat doubling your money while reducing your taxable income. And, of course, the deal is sweet indeed if you're among those lucky workers whose plan offers a cream-of-the-crop lineup of mutual funds. But what  exactly constitutes such a selection? Good question. Cheap price tags and seasoned management are key, as is intelligent diversification.

On that front, your plan should feature an anchor fund that specializes in stalwarts such as Microsoft (NASDAQ:MSFT), AT&T (NYSE:T), and IBM (NYSE:IBM). That's especially the case these days. Indeed, despite their strong balance sheets and rock-solid free cash flow (FCF) track records -- attributes that ought to be in favor during a fear-led market -- that particular power trio currently sports price-to-earnings (P/E) ratios below both their five-year averages and the broader market.

At the same time, your plan should also provide a fund whose managers look toward growth-oriented fare such as Schlumberger (NYSE:SLB) and eBay (NYSE:EBAY) -- two stocks that sport attractive valuation profiles just now, despite robust earnings-growth estimates over the next five years. Accenture (NYSE:ACN) and Hewlett-Packard (NYSE:HPQ) are also contenders for such funds, with bang-for-buck profiles that look especially juicy in the wake of the market's season of turbulence.  

The bottom line? If your plan keeps a lid on costs and provides vehicles that you can, um, drive across the market's valuation spectrum, then give your administrator props: He or she has provided a smart way to build a diversified portfolio.

Take it to the limit
Another smart way for retirement-minded workers (i.e., all of us) to proceed involves a Roth IRA. Provided you don't exceed the income limits, you can contribute to a Roth in addition to the moola you plunk down in your 401(k). Savvy investors should do just that.

Yes, unlike a traditional IRA, you'll invest after-tax dollars. The trade-off, though, is that when you pass the 59-and-a-half-year mark, you're free to tap those proceeds -- which grow on a tax-free basis -- without paying Uncle Sam a single cent in taxes.

When it comes to preparing for your financial future, a Roth is another deal that's tough to beat.

Stay informed
If you want to retire in style while meeting important near-term goals like buying a house or funding a child's college education, it pays (literally!) to stay up to speed on your options for getting those jobs done. Smart portfolio construction is a must, for example, as is knowing how to take maximum advantage of taxable (as well as tax-favored) accounts.

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This article was originally published on Dec. 7, 2006. It has been updated.

Shannon Zimmerman runs point on the Fool's Ready-Made Millionaire and doesn't own any of the companies mentioned. Microsoft, eBay, and Accenture are Motley Fool Inside Value choices. eBay is also a Stock Advisor recommendation. You can check out the Fool's strict disclosure policy by clicking right here.