Marco Arment is reporting that Apple's trusty App Store is offering up corrupt apps for download, supplying updates that are buggy and tend to crash as soon as they're launched.
So far apps such as Instapaper, GoodReader, PDX Bus and Angry Birds Space HD Free have all been observed to display the problem, but we suspect there are more. In some cases—such as with the Mac app SmartReporter—the problem has even been observed to appear and then quickly be rectified.
The developers from GoodReader have explained that "the problem stems from an encryption issue on the App Store side, resulting in customers receiving binaries that iOS refuses to launch." In the meantime, then, it might make sense to avoid updating any apps you plan to rely on, at least until Apple announces the problem is fixed.