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 AVG Technologies (NYSE: AVG) have popped today by upwards of 13% on the heels of an upbeat earnings release and cheery guidance.

So what: The anti-virus-software maker posted first-quarter revenue of $83 million, with adjusted net income of $18.2 million, or $0.34 per share. Analysts would have been happy with just $76.7 million in sales. CEO J.R. Smith said the company grew its user base and increased revenue per average active user, while bolstering its product portfolio.

Now what: The majority of growth was driven by its platform-derived segment, with sales more than doubling to $36.4 million, while subscription revenue only grew by 8% to $46.6 million. Second-quarter guidance expects revenue to be between $80 million and $82 million, with adjusted earnings per share in the range of $0.26-$0.28. AVG is raising its full-year forecast, with fiscal 2012 sales expected to be in the range of $327 million-$335 million, up from the prior range of $317 million-$325 million. The company's profit forecast was also bumped up and adjusted net income is now expected between $60 million and $63 million.

Interested in more info on AVG Technologies? Add it to your watchlist by clicking here.