New Design/UI (Eg: Ribbon control)
Silverlight WebPart
Improvement in browser compatibility
Improved Central Administration UI
Edit your pages directly
Rich Theming
Visio support
New SharePoint designer (2010)
Faster Search

 
SharePoint 2010 will be available ONLY for 64 bit hardware
Hardware requirements for SharePoint 2010 are:
 

64 bit Hardware
64 bit OS (Windows Server 2008)
64 bit SQL Server

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The Productivity Hub is a Microsoft SharePoint Server 2007 site collection that offers training materials for end-users. Microsoft has developed the Productivity Hub to help support your ongoing end user training efforts.
Microsoft has developed the Productivity Hub to help support your ongoing end user training efforts. The Hub is a SharePoint [...]

Guidance for building collaborative applications that extend your LOB systems
This guidance helps architects and developers design, build, and test intranet and enterprise-scale SharePoint applications. Two reference implementations demonstrate solutions to common issues, and a library provides reusable components that can help you with your own development projects.
Developing SharePoint Applications guidance helps customers accelerate constructing advanced [...]

Read some articles about new Microsoft Visual Studio 2010. Here are some major points I liked well while reading.
 

Support for Windows Azure platform – The new trend “Cloud Computing”
Parallel application support – Let your application a powerful one. (Framework 4.0 have P-Linq etc.)
New WPF based IDE – some good features are:

Inline call hierarchy
Highlight References etc.

Improved [...]

www.codegain.com is new for me. I thought I must post my next article there as I liked the name ‘CodeGain’
Click here to read this article article
My intention for this article was to provide a kick start for the SharePoint developers to write a Custom Provider for their database. You should be able to:

Use [...]

There are many ways to deploy your webpart to your SharePoint website. Here is one. Please use some search engine to find more methods
For this demonstration, I used these tools:

Visual Studio 2008
WSS 3.0

 
I used Visual Studio 2008 SharePoint extensions 1.2 also but you do not need to bother about this.
Consider the following WebPart:

using [...]

The WebPart1.testxyz class does not derive from the Microsoft.SharePoint.WebPartPages.WebPart class and therefore cannot be imported or used in a WebPartZone control.
A quick fix for this error will be to change System.Web.UI.WebControls.WebParts.WebPart to Microsoft.SharePoint.WebPartPages.WebPart
Eg:

public class testxyz : Microsoft.SharePoint.WebPartPages.WebPart
//instead of System.Web.UI.WebControls.WebParts.WebPart
 
{
}

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It is very simple. Just put [WebBrowsable(true), Personalizable(true)] above your property in code. (There are much more attributes – FYI).
Here is the sample source code:

public class testxyz : System.Web.UI.WebControls.WebParts.WebPart
{
private string _strHello = "blah";
public testxyz()
[...]

Resolution:

Take project properties (right click - Solution Explorer –> Project Name)
Take Debug tab
Verify Start Action section. Most probably you may be having wrong URL for your SharePoint in Start browser with URL

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The feature name WebPart1 already exists in SharePoint. You need to rename the feature before solution deployment can succeed
This is a common error when you (especially a beginner) try to ‘execute’ a SharePoint webpart from Visual Studio. Here is a fix explained.

If you do not see a pkg folder in your solution explorer then click [...]