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 Chinese real-estate services specialist E-House (China) Holdings (NYSE: EJ) sank 10% in intraday trading Monday on above-average volume.  

So what: E-House shares are flirting with new 52-week lows and have fallen a nasty 55% over the past nine months alone. There doesn't seem to be any specific news driving today's move, but given the global financial fears fueling the broader market sell-off, it's natural that that the highly volatile Chinese penny stock is experiencing some extra pain.

Now what: While it might be tempting to bet on E-House for a short-term bounce, the stock remains a questionable long-term opportunity. Specifically, it's tough to get comfortable with the company's low single-digit returns on equity, P/E of about 30, and worrisome exposure to China's bubbly real estate market. If you're looking for a way to get into the space, U.S. counterparts CB Richard Ellis (NYSE: CBG) and Jones Lang LaSalle (NYSE: JLL) might be safer ways to play.

Interested in more info on E-House? Add it to your watchlist.