Microsoft发布Member Management 组件 for ASP.NET v1.1  

A Simple Drag And Drop How To Example

http://www.codeproject.com/aspnet/NickPhotoBrowser.asp

An intelligent 404 page

http://www.codeproject.com/aspnet/intelligent404page.asp

Photo album browsing control

http://www.codeproject.com/aspnet/NickPhotoBrowser.asp

XML+XSLT的无限菜单

http://www.webuc.net/MyProject/menu/menu.htm

ASP.NET Upload

http://www.aspnetupload.net/default.aspx

iTextSharp，类库，创建PDF、RTF、XML等，并可解析PDF，功能最强，
http://sourceforge.net/projects/itextsharp/