A new aricle of mine about creating custom provider with LinqExtender is published at dotnetslackers, please check that out and dont forget to ping me in the forum if you have something to about LINQ, your little involment can make this forum lively. :-)
You can check that out at http://dotnetslackers.com/articles/csharp/CreatingCustomLINQProviderUsingLinqExtender.aspx
Thanks,
Mehfuz Hossain