I'm looking to learn more about Linq to Sql, but I'm looking for a quick getting started tutorial. Can anyone recommend one?
I like Scott Guthrie's tutorial: http://it-box.blogturk.net/2007/10/19/linq-to-sql-tutorial-series-by-scott-guthrie-pdf-book-format/
As a supplement to book or web-learning, LinqPad (http://www.linqpad.net/) is a great way to learn Linq to SQL. The download includes quite a few examples, and you can try things out directly.
I read through most of the Linq documentation in the MSDN Library and found it quite good!
I see someone already recommended Scott Gu's blog. I think that's a really good starting point and I've used it a lot.
I would go directly to his blog in addition to the PDF. Maybe the PDF has it, but here is part 1-9: http://weblogs.asp.net/scottgu/archive/2007/09/07/linq-to-sql-part-9-using-a-custom-linq-expression-with-the-lt-asp-linqdatasource-gt-control.aspx
The blog also has comments under each part where Scott answers some questions so I think it's useful. Plus his blog in general is really good. There are a few of other Linq related posts that are interesting.
This is a good series of videos that learn Linq 2 sql from learnvisualstudio.net
Also a good reference is the 101 LINQ Samples site. It has different examples on every statement and also shows the result from every query. Good stuff (-: