Although we don't believe in timing the market or panicking over market movements, we do like to keep an eye on big changes -- just in case they're material to our investing thesis.

What: Shares of Insight Enterprises (Nasdaq: NSIT) rallied more than 10% for the second consecutive day thanks partly to a broad market rally and yesterday's blowout earnings report.

So what: Insight provides technology infrastructure to businesses, including professional services for organizations not large enough to contract with top outsourcers IBM and Infosys. It's good business: Revenue improved 16% last year. Normalized profit more than doubled over the same period.

Now what: Valuation may be driving the rally. Insight trades for a fraction of the long-term earnings growth analysts expect, resulting in a 0.59 PEG ratio as of this writing. If they're right, the stock may pop several times more before 2011 is over.

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Fool contributor Tim Beyers is a member of the Motley Fool Rule Breakers stock-picking team. He owned shares of IBM at the time of publication. Check out Tim's portfolio holdings and Foolish writings, or connect with him on Twitter as @milehighfool. You can also get his insights delivered directly to your RSS reader. We Fools may not all hold the same opinions, but we all believe that considering a diverse range of insights makes us better investors. The Motley Fool owns shares of IBM and is also on Twitter as @TheMotleyFool. Its disclosure policy is at least 10% better than other disclosure policies.