Via the mailbag… We used something similar to this tool when making our automation libraries for Whidbey.  It comes in handy when you work with lots of collections.

Page: http://www.geekproject.com/tools.aspx#9

Description

This is a wizard for C# in Visual Studio .NET 2003 which creates custom typed collections. The wizard will generate code for the collection with options to have a an enumerator nested or not and possibility to have custom validation code.