2.2 unofficial ?

[gTen]

Originally Posted by gullzway

Flash video+
Apps2sd+

Easiest way to get to 2.2:
[Stock Flash][Odin]Dk28 Extended 12/05/2010 inc. Root,GPS hack,Clockwork+Redir. - xda-developers

Sent from an Epic 3G on SERO

You forgot one of the most important features...hardware acceleration for apps via JIT..

Edit:
Forgot to mention GPs is fixed for the most part..

I found a list:

General Android OS speed, memory, and performance optimizations[52]
Additional application speed improvements courtesy of JIT implementation[53]
Integration of Chrome's V8 JavaScript engine into the Browser application
Increased Microsoft Exchange support (security policies, auto-discovery, GAL look-up, calendar synchronization, remote wipe)
Improved application launcher with shortcuts to Phone and Browser applications
USB tethering and Wi-Fi hotspot functionality
Added an option to disable data access over mobile network
Updated Market application with batch and automatic update features[52]
Quick switching between multiple keyboard languages and their dictionaries
Voice dialing and contact sharing over Bluetooth
Support for numeric and alphanumeric passwords
Support for file upload fields in the Browser application[54]
Support for installing applications to the expandable memory
Adobe Flash 10.1 support[55]
Support for extra high DPI screens (320 dpi), such as 4" 720p[56]