Restrictions on a WebPart in a sandbox solution

http://blah.winsmarts.com/2009-12-you_can_deploy_WebParts_as_Sandboxed_solutions__but.aspx.

SharePoint Debugging

The ULS logs available at 14\Logs. You may need to tweak the logging level in central administration to view your actual error messages. Also, you can try out this tool at
http://code.msdn.microsoft.com/ulsviewer.
If all these steps fail, use the techniques described in this article
http://www.code-magazine.com/Article.aspx?quickid=0907041.

Showing Actual Error Message in SharePoint 2010

When SharePoint custom code runs into an error, by default SharePoint will log that error and it will show user a generic error. In order to view the actual error message, you will need to make three changes to your web.config:
1. Change the SharePoint\SafeMode\@CallStack attribute to true.
2. Change System.Web\CustomErrors\@Mode attribute to Off.
3. Change System.Web\Compilation\Debug mode to true.
Making these changes will allow you to both attach to W3WP.exe and run your code in debug mode, and to view actual error messages.

Optimizing SharePoint

A very good blog on optimizing SharePoint http://www.sharepointnutsandbolts.com/2009/06/my-checklist-for-optimizing-sharepoint.html

A really good link for Startup-tips

http://philip.greenspun.com/business/startup-tips/

Manage SharePoint services easily

Running SharePoint 2010 on Windows 7 and don’t want it to slow you Box down when not really required:

A very good utility to manage SharePoint services (single click on and off).
http://sharepointserviceman.codeplex.com/

SharePoint 2010 Top 10 Resources to get you started

http://sites.google.com/site/hj1702/Home/moss-2010-resources

LDAP connection string to fetch groups for an OU

LDAP://Domain.com/OU=RAAM,DC=Domain,DC=com