According to another email purportedly addressed from Steve Jobs, Jobs acknowledged an ongoing issue for many iPhone users that result in 3rd party applications repeatedly crashing:
Many report the iPhone 2.0 firmware suddenly failing to load non-default apps regardless of their nature, briefly loading them before abruptly jumping back to the home screen.
The bug occurs both with freshly downloaded software and with updates, but is reported as never having a definite fix; although some report successfully deleting and re-downloading apps to regain access, others find the solution either having no effect or gradually decaying over time to where the apps again fail to run. Restoring the iPhone also seldom works.
The one line response states "This is a known iPhone bug that is being fixed in the next software update in September."
Steve Jobs (or someone acting on his behalf) has been known to respond to emails.