Looking at the release notes:
Highlights of the ATI
Catalyst™ 9.11 Windows release
include:
New Features
GPU Acceleration of H.264 video content
using Adobe
Flash Player 10.1 Beta
This release of ATI Catalyst™ supports the new Hardware Acceleration
features of Adobe Flash Player
10.1 Beta for video encoded in the H.264 format. Adobe Flash
Player 10.1
Beta introduces hardware-based H.264 video decoding to deliver smooth
video
playback, reduce system resource utilization, and preserve battery
life.
Adobe Flash Player 10.1 Beta is expected to be available for
download
from Adobe Labs (labs.adobe.com)
before the end of the year. This feature is supported
on the ATI Radeon HD 5800, ATI Radeon HD 5700 and ATI
Radeon HD 4000
Series of products
High Quality downscaling for video
transcoding MSE
This release of ATI Catalyst™
includes an enhancement
for the ATI Video converter for users transcoding high quality
interlaced content
(1920x1080i @60i videos) down to small resolution progressive content
(320x240
@30p - iPod videos as an example), by maintaining high visual quality
when
down-scaling by a significant amount and converting interlaced video
content to
progressive.
Highlights of the Linux ATI
Catalyst™ 9.11 release
include:
New Feature
Support for new Linux operating systems
- This release of ATI Catalyst™
Linux introduces support for the following new operating
systems:
- RHEL 5.4 support
- openSUSE 11.2 early look support
AMD's chief marketing officer, Nigel Dessau, gives his (AMD-orientated) slant on the announcement here, and you can download the H.264-optimised Flash 10.1 beta here.
Anyway, here are the link to the drivers:
Cat 9.11 - Windows 7/Vista - 32-bit
Cat 9.11 - Windows 7/Vista - 64-bit
Cat 9.11 - Windows XP - 32-bit
Cat 9.11 - Windows XP - 64-bit
Full release notes here (PDF).
