Judging from how quickly almost all of Apple’s [AAPL] free iPhone Tech Talk World Tour sessions have filled, it appears that developer interest in the iPhone (and iPod touch) is still very much alive, at least in the U.S.
Of course, it may have something to do with the free aspect of the tech sessions. Plus, there was no information about the total available attendee seats available for each of the locations.
Furthermore, using the iPhone SDK has not been as convenient for the developer community as, say, the Android SDK, which is Java-based and has a greater developer mindshare. And the allegations against Apple about being too proprietary and “closed” in nature, especially with regard to the iTunes App Store‘s product acceptance policies and recent events regarding the storefront, have soured the initial developer attitude toward iPhone development.
The need for Apple to become developer-friendly in the climate of current financial crises is extremely high: already, there has been a dramatic drop in value of the company’s stock by about 50%, and more bleeding may occur as consumer purchasing continues to dry up. This means that encouraging third parties to bring value-added capabilities to Apple hardware in the form of software and services is critical.
Oddly enough, Apple’s iPhone developer sessions are quite reminiscent of Sun’s developer Tech Days sessions, which have been offered on-and-off for quite a few years now.
N.B.
Note that the designation of “FULL“, according to the note on the enrollment screen, does not exclude you from signing up on some sort of “wait list”… 
Give it a shot, folks, if you didn’t have the opportunity to sign up earlier.
