I think that many in the mobile phone industry are very scared because they realize that they are possibly 3-5 years behind the iPhone's potential. I say potential because the iPhone still has a number of improvements to add to fill some of the functionality holes everyone on this forum has complained about (IM, copy/paste, upgrade email, disk use, more storage, poss GPS, etc, etc). But its true potential is in it's ability to integrate with the web and your desktop seamlessly.
The iPhone is more than a phone, it is an integrated computing platform. Consider what Apple has the 'potential' to do with the iPhone just through software updates:
1) Mobile version of iWork
2) Mobile version of iChat
3) Finger tip file browsing on the phone with Coverflow
4) Sharing one calendar between all Macs & iPhone through iCal
5) Seamless integration with online account (.Mac)
6) Back to My Mac feature could allow you to access your home Mac from your iPhone and access any content you have stored there
What other phone manufacturer is even close to providing this level of functionality (seamlessly) in the next 3 years or so? Apple just has to start pulling this all together with software and it will be the most powerful and flexible mobile computing environment we've ever had.
Many will copy the touch interface and do a good job at it by 2008, but the real gap that will take them years to catch up to is the ability to make the phone a true extension of your existing computing environment. Apple is way ahead of the game.