Deploy ASP.NET Web Applications to SharePoint _layouts folder

http://msdn.microsoft.com/en-us/library/cc297200.aspx

http://www.ozgrid.com/forum/showthread.php?t=88208

http://blogs.msdn.com/cjohnson/archive/2007/12/15/building-a-simple-asp-net-page-based-sharepoint-application-in-visual-studio-with-the-visual-studio-extensions-for-wss-ctp-1-1.aspx

http://www.sharepointblogs.com/jscott/archive/2008/04/15/integrating-asp-net-2-0-web-pages-into-sharepoint-2007.aspx