Albatron to the rescue with their new Blu-Ray decoder card.

Actually it's an Nvidia 8500GT graphics card with full HD video acceleration for Blu-Ray & HD DVD (H264) playback, This should fit very nicely inside the XL series of media centres. Full list of features after the click. (nb. Albatron call it Blue Ray)

Albatron's Blue Ray Decoder Card System Requirements

1. Free PCI Express x16 slot
2. BD DVD ROM or HD DVD ROM for software installation
3. 32MB system RAM minimum
4. Operation system - Windows Vista, Windows XP, Windows 2000

Blue Ray Decoder Card Chipset Features

1. Microsoft DirectX 10 Shader Model 4.0
Supports delivers unparalleled levels of graphics realism
and film-quality effects for all DirectX applications

2. CineFX 5.0 Engine
a. Next-generation texture engine
b. With infinite-length vertex and pixel shader capabilities,
stunning image quality and floating point accuracy at
ultra-fast frame rates
c. Full 128-bit sudio-quality floating point precision through
the entire rendering pipeline

3. NVIDIA UltraShadow II Technology
Advance technology designed to enhance the performance
of shadow-intensive games

4. NVIDIA Intellisample 4.0 Technology
a. Rotated-grid anti-aliasing for removing jagged edges for
incredible edge quality
b. Support for advanced lossless compression algorithms for
color, texture, ad z-data at higher resolution and frame rates

5. NVIDIA PureVideo Technology
a. Integrated HDTV output
b. MPEG-2 HD and WMV HD video playback up to 1920 x 1080p
resolution
c. H.264 hardware decode acceleration
d. Spatial-temporal de-interlacing
e. Inverse telecine 2:2 and 3:2 pull-down
f. Overlay color temperature correction

6. GigaThread Technology
Massively multi-threaded architecture supports thousands of
independent, simultaneous threads, providing extreme processing
efficiency in advanced, next generation shader programs

7. Integrated TV encoder
Provides best-of-class TV-OUT functionality with resolutions
up to 1024x768

8. Integrated full hardware H.264/ MPEG-2/ WMV decode acceleration

9. NVIDIA nView Multi-Display Technology
a. Great multi-display technology
b. Easy-to-use control panel interface
c. A setup wizard makes configuring your desktops a snap

10. NVIDIA Digital Vibrance Control 3.0
a. DVC color controls
b. DVC image sharpening controls

11. 400MHz RAMDACs
Blazing-fast RAMDACs support dual QXGA displays with
ultra-high, ergonomic refresh rates

12. One Dual-link DVI
Able to drive the industry? largest and highest resolution
flat-panel display up to 2560x1600 resolution

13. NVIDIA ForceWare Unified Driver Architecture（UDA）
a. Delivers a proven record of compatibility, reliability, and
stability with the widest range of games and applications
b. ForceWare provides the best out-of-box experience for
every user and delivers continuous performance and
feature updates over the life

14. OpenGL 2.0
Ensures top-notch compatibility and performance for OpenGL
applications

Albatron's Blue Ray Decoder Card Features

1. Powered by nVIDIA GeForce 8500GT GPU
2. Microsoft DirectX 10 Shader Model 4.0
3. nVIDIA GigaThread Technology supported
4. One Dual-link DVI output display & PureVideo HD Technology
5. HDCP compliant & OpenGL 2.0 Technology
6. Dual 400MHz RAMDACs
7. DVI, TV-out Ports

Albatron's Site