Well I have to say that after using the iPhone 3G with the 2.0.2 patch for half a day I have a few observations:
1. It appears that I no longer have the application not launching bug anymore. This would be awesome if it's fixed in my phone. It's been a quirky annoyance.
2. The keyboard is definitely more responsive in all applications.
3. Battery life APPEARS to be better, normally it would be much lower by this time.
Stay tuned for more results as I continue to use my iPhone :)