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

Stocks are sliding again today as blue-chip earnings roll on, with the Dow Jones Industrial Average (DJINDICES:^DJI) down more than 31 points as of 2:30 p.m. EST. The Dow's getting little help from tech stock IBM (NYSE:IBM), which reported earnings yesterday and has since dropped a steep 3.4%. However, the outlook's not all bad for investors today: United Technologies (NYSE:UTX) has managed to make the most of its own earnings report this morning and is in the green, trailing today's big Dow leader, Boeing (NYSE:BA). Let's catch up with what you need to know.

IBM's revenue keeps on falling
Things just haven't gone well for IBM lately. The stock was one of the Dow's worst components last year and has lost ground over the past 52 weeks despite the market's huge rally. Today won't help. IBM reported quarterly earnings yesterday after the closing bell, and while the company's earnings did grow by 6% to beat analyst expectations, revenue fell 5.5% -- the seventh consecutive quarter in which Big Blue has seen sales drop.

IBM's hardware division has lost 26% in revenue year over year. Worse, emerging markets haven't managed to catch on at IBM either, particularly in China, where the company saw revenue plunge by 23%. It's all adding up to a shaky future for the company, and while IBM's done a good job of meeting profit forecasts over the past few quarters, analysts are concerned that the trend of falling revenue could mean an earnings miss could be coming in the near future. Regardless of hits or misses, IBM certainly needs to find a growth spark soon to keep investors around.

United Technologies isn't having the same trouble with earnings-related stock drops today, as the conglomerate's shares have climbed by 0.9% so far to rank among the Dow's leaders. Net income fell by 29% in its last quarter, according to the earnings report issued this morning. On an adjusted basis, United Technologies still managed to beat Wall Street's profit projections handily.

Revenue missed expectations slightly, although a delay in meeting a helicopter contract negatively affected United Technologies in that department. The company's aerospace systems sales grew by 9%, while its Pratt & Whitney subsidiary saw sales jump 5%. Even with defense budgets under fire, aerospace is an industry on the rise and should continue to fuel growth at United Technologies in the near future.

Look no further than fellow Dow aerospace player Boeing to see how much momentum this industry can deliver. Boeing is the Dow leader on the day, with the stock up 1.8% so far. It was also the Dow's leader by a wide margin in 2013, and commercial aerospace sales and deliveries continue to soar at Boeing. China's market for airplanes has grown mightily in the recent past, and Boeing announced this week that it plans to ship 140 planes to the country in 2014. That's just below the record 143 aircraft it shipped last year. If Boeing can keep up this momentum in the world's second-largest economy, it'll carry investors on a welcome ride for a long time to come.