This information is found on the MacNN website.
The firmware 2.0.1 would already be in the testing phase for correct the many bugs in firmware 2.0.
It is true that the OS 2.0 looks good less stable than its previous version. Many users complain davaries and it’s not uncommon for the device to blocked and force him restart.
It’s not uninteresting to remember that Apple about the general public, iTunes, Mobileme, lApp store, the Firmware 2.0 and liPhone 3G in less than two days.
This way of working is not, it seems to me, in the habits of Steve Jobs and of his team.
We discuss it on the forum.