I found a very large collection of ASP.NET AJAX videos on MSDN that I thought that you might be interested in. There are about 60 of them! This is Part 3, and here are the links for Part 2 and Part 1.
Enjoy,
~Robert Shelton
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#41 | How Do I: Use the NumericUpDown Extender Control?
21 minutes, 50 seconds
#42 | How Do I: Use the ASP.NET AJAX History Control?
8 minutes, 59 seconds
#43 | How Do I: Use the ASP.NET AJAX ValidatorCallout Extender?
11 minutes, 6 seconds
#44 | How Do I: Implement the AJAX After Processing Pattern?
5 minutes, 40 seconds
#45 | How Do I: Use the ASP.NET AJAX ResizableControl Extender?
30 minutes, 18 seconds
#46 | How Do I: Use the ASP.NET AJAX Tabs Control?
8 minutes, 13 seconds
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#47 | How Do I: Update Multiple Regions of a Page with ASP.NET AJAX?
7 minutes, 18 seconds
#48 | How Do I: Choose Between Methods of AJAX Page Updates?
11 minutes, 23 seconds
#49 | How Do I: Use the ASP.NET AJAX SlideShow Extender?
19 minutes, 27 seconds
#50 | How Do I: Use the ASP.NET AJAX UpdatePanelAnimation Extender?
20 minutes
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#51 | How Do I: Use Other JavaScript User Interface Libraries with ASP.NET AJAX?
13 minutes, 34 seconds
#52 | How Do I: Use the ASP.NET AJAX Profile Services?
11 minutes, 4 seconds
#53 | How Do I: Debug ASP.NET AJAX Applications Using Visual Studio 2005?
8 minutes, 21 seconds
#54 | How Do I: Build a Custom ASP.NET AJAX Server Control?
20 minutes, 22 seconds
#55 | How Do I: Use JavaScript to Refresh an ASP.NET AJAX UpdatePanel?
10 minutes, 5 seconds
#56 | How Do I: Determine Whether an Asynchronous Postback has Occurred?
5 minutes, 14 seconds
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#57 | How Do I: Use the Conditional UpdateMode of the UpdatePanel?
13 minutes, 9 seconds
#58 | How Do I: Implement the Persistent Communications Pattern with the UpdatePanel?
12 minutes, 1 second
#59 | How Do I: Localize an ASP.NET AJAX Application?
28 minutes, 49 seconds
#60 | How Do I: Implement the Persistent Communications Pattern using Web Services?
16 minutes, 37 seconds
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#61 | How Do I: Trigger an UpdatePanel Refresh from a DropDownList Control?
9 minutes, 5 seconds
#62 | How Do I: Create an ASP.NET AJAX Extender from Scratch?
15 minutes, 11 seconds
#63 | How Do I: Build Custom Server Controls that Work With or Without ASP.NET AJAX?
19 minutes, 21 seconds
#64 | How Do I: Associate AJAX Client Behavior with an ASP.NET Server Control?
18 minutes, 13 seconds
#65 | How Do I: The AJAX Toolkit Reorder Control
21 minutes, 56 seconds
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#66 | How Do I: Retrieve Values From Server Side AJAX Controls
8 minutes, 28 seconds
#67 | Two Simple Techniques for Triggering Updates to Update Panels
9 minutes, 23 seconds
#68 | Use ASP.NET AJAX Cascading Drop Down Control to Access a Database 32 minutes, 23 seconds