Here's a list of free programs and plugins for Windows Media Center:
Media Center Studio
This is a program to change the theme and personalize the start menu of Windows Media Center. You can install pre-made themes or create your own. You can add, hide, rearange and rename menu items. It's also possible to add other programs to the start menu. With one click you can revert back to the original settings of Windows Media Center. It is still a beta and some people from certain country's reported that they don't get the menu changed but here in the Netherlands it works perfectly.
Media Center Studio Media Center Studio Menu Fix
If you are not able to change the menus of Windows Media Center with Media Center Studio
this is a temporary fix a member of the GreenButton made.
Quick temp fix for Media Center Studio - The Green Button Media Center Studio how-to
A quick guide to get you started with Media Center Studio.
Customize the Windows Media Center Start Menu with Media Center Studio - How-To Geek Media Center Studio Themes
A collection of themes that are adapted to work with Media Center Studio.
http://www.hack7mc.com/2010/04/media...e-updates.html 7MC Themes - Windows Live Windows7 Media Center Themes for Windows 7 My Channel Logos
This program will add television channel logos to the Windows Media Center program guide. It has a database for the channel logos used in different country's but you can add your own logos if your country is not in the database.
Home TV Gemist
This is a plugin for the Dutch or Belgian users of Windows Media Center, it will allow you to watch programs you missed from the major Dutch television channels and to watch different Dutch internet theme channels. Some of the programs and channels are in English so maybe also interesting for other users.
TV Gemist Heatwave
This is a alternative plugin to the standard weather service in Windows Media Center. It shows todays and a four day forecast in one window and you can add more cities to watch. It's very stylish and has a lot of options and even a (beta) option for different languages translated with Google.
[UPDATED] Heatwave Vista 1.3: Groovy Live Weather for Vista and Windows 7 Media Center - The Green Button Media Browser
This plugin takes your recorded, digital, or ripped media and presents it in a simple, easy to use interface. It can automatically add metadata, stream the latest movie trailers, supports Vodcasts and has multiple themes.
media browser Remote Potato
With this program you can record shows, watch shows, manage recordings and browse the EPG over the internet from any web browser, even on mobile devices.
FatAttitude MacroTube
With this plugin you can watch YouTube, Dailymotion and MSN Soapbox videos from within Windows Media Center. You can add or remove providers and it has a onscreen keyboard to make it easier to search for your favorite videos.
MacroTube 0.8 Beta: YouTube, Dailymotion, and more in Media Center - The Green Button RadioTime
With this plugin you can listen to thousands of internet radio stations listed at RadioTime.com. You can browse by station type and it has a seperate menu for your local radio stations. If you want to use the presets option you need to set up a free account at RadioTime.com. For Windows 7 users you need to download the installer from the link below the Get It Now button.
Browse RadioTime with Windows Media Center! MC7 Sleep Timer
This plugin adds a sleeptimer function to Windows Media Center. You can set up a custom time and to switch off the monitor. At the moment it doesn't work with extenders.
MC7 Sleep Timer - The Green Button TunerSalad
Windows Media Center is standard limited to the use of a maximum of four tuners, with this program you can increase the number of tuners you can use.
TunerSalad
Feel free to mention other free programs or plugins you know and I will add them to the list.
MK2