The MVC framework is completely separate from your data-access technique so you can use whatever type of data access layer you want with it, including the plain old ADO.NET classes. A lot of the samples use direct table access because that is the way the wind is blowing at the moment and it offers the most flexibility.
Linq to SQL works pretty well with stored procedures so may well be of use to you.
The MVC Framework pretty much focusses on managing the views and controllers. The model part is left up to you to implement however you see fit.
