Javascript : Prototype

The 'Protype'keyword allows to add extented properties to an existing object.
Its awesome how powerful is this language.
Whatever you think about it, you have to deal with it, so master the beast ;-)
Here is an example on how to add the 'reverse' propertie to all instances
of 'String' objects
http://www.javascriptkit.com/javatutors/proto2.shtml

ASP.NET AJAX Control Development

An in depth guide to developing controls with the ASP.NET AJAX
from Kazi Manzur Rashid

http://dotnetslackers.com/articles/ajax/ASPNETAJAXControlDevelopment.aspx

Json.NET

Thanks to James Newton-King for his great library
http://www.codeplex.com/json

Use C# and VB.NET in the same project

With all the care it takes, Mark Smith explains the method
http://www.worldofasp.net/tut/1/Use_Csharp_and_VBNET_in_the_same_project_107.aspx

Visual Basic 9.0 Feature Focus - LINQ Queries

Bart's article on new features of VB9 about LINQ
http://community.bartdesmet.net/blogs/bart/archive/2007/09/05/visual-basic-9-0-feature-focus-linq-queries.aspx

VB.NET Imports Alias

In case of you missed Python 'import as' :-)
Here the VB.NET equivalent

Imports cfg = System.Configuration.ConfigurationSettings

http://weblogs.asp.net/eporter/archive/2003/08/12/23892.aspx

Control ID Naming in Content Pages

The renaming id when using Master Pages
can be a pain
Here is an article to get out of it
http://www.asp.net/LEARN/master-pages/tutorial-05-vb.aspx