Here's another really simple extension for BlogEngine.Net. This one allows you embed your xbox live gamercard into a post by simply typing the following (without the spaces near the [])

[ xboxgamercard:gamertag ]  -  Replace gamertag with your gamertag

The result looks like this :-

To Install, copy XboxGamercard.cs into the app_code\extensions directory.

You can download the extension below: 

XboxGamerCard1.0.zip (868.00 bytes)