I've read all the materials on VS2010 and .NET 4.0 already, but who knows, there is a good chance there is something that I may have either missed completely, or misunderstood the significance of. Let's see if I can learn something new.

VS2010; selecting variables highlights them throughout the code. Holding alt-key down you can select rectangles in the code, and then edit them. Show Call Hierarchy shows where methods call to and get called from.

Sharepoint; Dev tools are a bit sub-par at the moment. VSeWSS is little known MS tool to deal with this. Still has a lot of issues though. VS2010 can browse SharePoint, create items, deploy. Server explorer similar to database explorer. Can add new items through the explorer. Need to have SharePoint server installed locally to do this! LINQ to SharePoint to access data; very nice.

C# 4.0; love the duck-typing image... includes IronPython and IronRuby. Now has optional and named parameters, which is nice... still do not like that it inherits the brain-dead VB.NET attributes; also, consider combinatorial explosion for unit-testing.

VB10; not sure I care about this... gets automatic properties, collection initialisers, no need for end-of-line underscores. Demo is not exactly making me feel like I should bother with VB.

ASP.NET 4.0; SEO - routing and permanent redirect, live data-binding, enhanced dynamic data, MVC, QueryExtender. Adding routes easy; map new URL to old format internally; need to change parameter extraction though, more manual work than I'd like to see. Use RedirectPermanent instead of Redirect for correct semantics for moved pages. Live two-way data-binding looks good, but not sure what it 'means'... losing focus and glazing over a bit... just gonna post this.