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: TravelZoo (Nasdaq: TZOO) dropped 10% in intraday trading today after competitor Priceline.com (Nasdaq: PCLN) announced far, far better than expected earnings and guidance.

So what: Priceline reported non-GAAP EPS of $5.49, trouncing the consensus estimate of $4.91. Management guided Priceline's non-GAAP EPS for the current quarter to $9.10 to $9.30, well above the $7.98 consensus estimate.

Now what: What a difference from TravelZoo's July 21 earnings report, when EPS of $0.30 badly missed the consensus estimate of $0.39. TravelZoo's revenue grew 34% year over year, well below Priceline's revenue growth of 44% year over year. That suggests that Priceline is taking market share. What's more, TravelZoo's disappointing results probably kept expectations low going into Priceline's earnings report.

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Fool contributor Cindy Johnson owns no shares of any company named above. We Fools don't all hold the same opinions, but we all believe that considering a diverse range of insights makes us better investors. The Motley Fool has a disclosure policy.