Building n-tiered ASP.NET apps

A friend on the ASP.NET architecture forum pointed me to these great learning resources for building n-tiered Web apps:

• http://imar.spaanjaars.com/QuickDocId.aspx?quickdoc=416

• http://imar.spaanjaars.com/QuickDocId.aspx?quickdoc=476

• http://weblogs.asp.net/dwahlin/archive/2007/02/05/video-creating-an-n-layer-asp-net-application.aspx

• http://weblogs.asp.net/dwahlin/archive/2008/02/28/building-an-n-layer-asp-net-application-with-linq-lambdas-and-stored-procedures.aspx

Thanks, ScottyB :)