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 trip-advice purveyor Travelzoo (Nasdaq: TZOO) got lost today, falling as much as 14.2% amid very heavy trading.

So what: The stock jumped sky-high two days in a row after a terrific earnings report, and it looks like traders got a wee bit too enthusiastic. All things considered, Travelzoo shares have still gained 16% since the earnings report.

Now what: Of course, oblique rival Rediff.com (Nasdaq: REDF) is soaring as much as 25% today after launching a discount program in India, which might compete to some degree with Travelzoo's fare. That's a stretch for explaining today's price drop, but still something to keep in mind. There's no shame in taking some profits after consecutive double-digit price gains, and Travelzoo has delivered a soul-crushing 350% return over the last 52 weeks.

Interested in more info on Travelzoo? Add it to your watchlist.

Fool contributor Anders Bylund holds no position in any of the companies discussed here. 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 is investors writing for investors.