Skim Web Parts

Codeproject: Introduction to Web Parts
MSDN: A Developer's Introduction to Web Parts
simple-talk: Web Parts in ASP.NET 2.0
(also, if you want to work with other PersonalizationProvider beside SQL Server)

Excel Object Model - .NET Perspective

- Understanding the Excel Object Model from a .NET Developer's Perspective
- Microsoft.Office.Interop.Excel Namespace

Netvibes Blog

http://blog.netvibes.com/

Netvibes Dark

Let's Try This: Web Parts + UpdatePanel

Darren Neimke's Web Parts Blogs

The author of the book - ASP.NET 2.0 Web Parts in Action

Reference on Web Parts

Quick Videos ASP.NET 2.0 Web Parts

1. Webcasts on creating ASP.NET 2.0 Webparts (March 25, 2007)

2. AJAX Enabling ASP.NET 2.0 Web Parts with "Atlas" (May 30, 2006)

Checking out Live.com's Web Gadget SDK

Multi-column Widget Drag & Drop

Omar AL Zabir: ASP.NET Ajax Extender for multi-column widget drag & drop

Asynchronous Web Parts

Extreme ASP.NET: Asynchronous Web Parts

ASP.NET Web Parts Pages

ASP.NET Developer Center: ASP.NET Web Parts Pages

10 Tips for Writing High-Performance Web Applications

MSDN Magazine: 10 Tips for Writing High-Performance Web Applications

ASP.NET Web Service / JSON / Simple Client Script Call

Client-Side Web Service Calls with AJAX Extensions

ASP.NET web service can be use to easily return JSON data format from a client script call w/o using the proxy class generation way.

Visual Web Developer - Change Dafault Browser

Changing the default browser used in VS 2005 and Visual Web Developer

Especially when testing on several browsers including if you have a simultaneously installed IE7, IE6, and Firefoxes.

The need for a better file upload paradigm

Flash, Silverlight, and JavaFX all look nice, but what I really want is better file upload

.NET Data Provider Types to .NET Framework Types

Mapping .NET Framework Data Provider Data Types to .NET Framework Data Types

ASP.NET 2.0 Page Life Cycle & Common Events

ASP.NET 2.0 Page Life Cycle & Common Events (PDF)
by: John Sheehan