Microsoft have released a resourse kit for asp.net - you can download it here. (134399 KB).
While it contains lots of sample web sites, code and presentations, the thing that really got me was that it includes the following asp.net controls for free (usually a single developer license meaning that one developer can use it, and can redistribute to anyone)
ComponentOne
This special edition of ComponentOne Studio for ASP.NET includes a development license for all of the Q2 2003 versions of ComponentOne Studio for ASP.NET (WebForms) components.
Infragistics
The NetAdvantage ASP.NET grid is an advanced grid with true hierarchical support and unbound mode, allowing you to provide a rich-client look-and-feel in your ASP.NET application.
/n software
IP*Works! CC ICharge provides and easy-to-use interface for communicating with major Internet Payment Aggregators (Payment Gateways).
SAX.NET
Sax.net Security for ASP.NET allows you to protect your server from automated programs.
telerik
telerik r.a.d.rotator is a multipurpose component for DHTML content rotation and personalization.
telerik r.a.d.spell enables developers to add multilingual spellchecking capabilities to their ASP.NET applications.
Not bad for free!