>Is there any benefit to converting my data access layer to Linq To SQL?

You may want to look past Linq to SQL to another technology like Entity Framework or NHibernate. One of the best advantages I've found is that Linq keeps me in the IDE, and I don't have to be switching back and forth between VS and SSMS. I also find that I spend a LOT less time writing Stored Procedures and more time focusing on creating a rich domain model.