Apple has released iPhone firmware 2.0.1 for the iPhone and iPod touch. It's available now through iTunes. The 249MB update's claim to fame is "bug fixes", lets hope it REALLY fixes the bugs that came with the 2.0 OS. Stay tuned.
***UPDATE***
AppleInsider is reporting more than bug fixes have been included with 2.0.1 firmware:
-You can now drag an app icon across multiple pages in one motion, rather than having to drag it, drop it, pick it up again and drag it over to next page, and repeat.
-Contacts are now more responsive.
-After installing 2.0.1, each successive backup is much faster.
-Apple may have changed the calibration of the iPhone's reception "bars" while connected to a 3G network to reflect a stronger signal than before.
-Keypad loads quicker.
-Screen rotation in Safari appears to be smoother.
-Some apps may ask to be updated after the firmware upgrade.
-Netshare still works (iPhone tethering application)