I have updated the
Xbox Live to Twitter application
and it works quite well now. There are currently too many updates as you can see from my twitter on the left of my blog 
.
I will hopefully be adding some more customisation functionality to allow “only online” or “only title” changes to propagate. I may try to add some SQL Compact bits so differences in Achievements can be logged, but the data is currently limited…
I like this play pen as it allows me to explore some of the .NET 3.5 functionality and improve (much needed) my UI skills.
You can download the application from CodePlex along with all the source code .
