I have found very helpful article that you would like also about performance of Linq to SQL. These optimizations will bring us to ADO.NET SqlDataReader performance.

There you are the article. 

I won't talk about how regex is useful. You know regex patterns are ugly and hard to understand then I saw Josh Flanagan's Readable Fluent Regex Api, there is another thing to like LINQ rigth now.

Very nice example to see how the api is cool. 

Download source and binaries.

Enjoy!

If you don't know Live Alert SDK, you don't know how to alert your users in a cool way ! Then you want to see it. There are some cool articles that you would like to see;

Alerting Your Users with Live Alerts and ASP.NET AJAX