Spain pays 2nd highest yield on short-term debt since the birth of the euro:
http://www.reuters.com/article/2012/07/24/us-spain-debt-idUSBRE86N0B520120724
Greece now in "great depression:"
http://www.reuters.com/article/2012/07/22/us-greece-clinton-depression-idUSBRE86L07L20120722
China PMI 5-month high, but still contracting
http://static4.businessinsider.com/image/500e0f1769bedde547000014-587-605/china-july-flash-pmi.jpg
Apple growth seen pausing as iPhone buyers await model
http://www.bloomberg.com/news/2012-07-23/apple-growth-seen-pausing-as-iphone-buyers-await-model.html
Of all the above factors, I think the potential for an AAPL miss (post Tues close) poses the greatest downside risk.
Europe is slowly but steadily being more priced in as EURUSD drops. China PMI is a blip, realistically not something worthy of cheering. AAPL, on the other hand, carries meaningful expectations of another blowout earnings report. When expectations get too one-sided, the reward/risk profile becomes asymmetric (skewed toward risk, at least in the short-term). AAPL meeting expectations could conceivably result in a pop-and-fade; whereas a whiff could touch off CMG-style carnage.