| server-side includes to maintain a consistent look across a website is a common way I've found to be useful. ASP+ has introduced pagelets, these pages are separate files or webpages that contain certain information you want displayed across several webpages. The nice thing about pagelet is they are very similar to server-side include files. Both file types allow to have the code in one file and using "DIRECTIVES" to call that page across several files. I've used server-side include files to maintain a similar look and feel for many of my webpages on ASPFree.com. I used this method to dynamically pass a TitleBarDemo variable that gets set on every page. Pagelets can also contain logic code that can greatly increase the power of what they perform. Pagelet(User Control) Code<script language="VB" runat=server>
'Declare a public variable that can be set
Public TitleOfDemo as String
</script>
<HTML>
<head>
<title><% =TitleOfDemo %></title>
</head>
<body>
</body>
</html> ASP+ page code'Registering the a pagelet (user control) file
'This gets listed at the top of the .aspx page
<%@ Register TagPrefix="ListFirst" TagName="ListSecond" Src="pagelet.aspc" %> 'Method of having the pagelet file executed
'Setting the TitleOfDemo variable to a value.
<ListFirst:ListSecond TitleOfDemo="ASPFree, this would show in the title bar!" runat="server"/> | 
ASP.NET Code 
Dynamic Sitemap and Navigation in ASP.Net
