iPhone release date, Availability and Third Party Applications

Steve Jobs had a Q&A with the Wall Street Journal's "D : All Things Digital" where he answered some quick questions on the iPhone.
He Confirmed that the iPhone would be available by late June.
When Mossberg (WSJ's technology columnist) asked him if it might be the last day of June, Steve replied "Uh, yeah ..."

When asked if there would be enough iPhones to make it available to more people on the release date, he quipped "I don't know, I hope not "

On allowing third party application developers, Steve said "This is an important trade-off between security and openness. We want both. We're working through a way, we'll find a way to let third parties write apps and still preserve security on the iPhone. But until we find that way, we can't compromise the security of the phone."

"I've used third-party apps. The more you add, the more your phone crashes. No one's perfect, and we'd sure like our phone not to crash once a day. If you can just be a little more patient with us, I think everyone can get what they want."

So now we know the iPhone will be released in late June, with it being possibly open to Third Party applications. Hopefully availability wont be an issue on release day, but we all know that wont be true.