Some people deserve accolades and Tanguy is one of those people. He has had many freely public tools that have helped implementers and CRM super users customize their systems. He has updated his tools for CRM 2011 and they now work for both Online and Onpremise. These are must have tools.
First about Tangy

View his complete profile
Technical consultant on Microsoft Dynamics CRM since version 1.2.
He works for ALSY (Orange Business Service subsidiary), one of the French leader in Microsoft Dynamics CRM integration.
His blog can be found here
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His tools
SiteMap Editor for Microsoft Dynamics CRM 2011
Features
- Connections to OnPremise, Online and Claim based deployments
- TreeView display of SiteMap
- Add SiteMap component with mouse usage
- Add default SiteMap component if you removed one
- Cut/Copy/Paste of SiteMap component
- Display Xml of SiteMap component
- Add SiteMap component from Xml
- Reset SiteMap to default system one
- Import back the SiteMap to CRM server
Screenshot

Download
As usual the application is available on codeplex
JavaScript Web Resource Manager for Microsoft Dynamics CRM 2011
this new tool allows you to update JavaScript web resources with the following features:
- Export scripts web resources from CRM server
- Save scripts web resources to disk
- Load scripts files from disk
- Edit scripts with default text editor or Visual Studio
- Edit web resource properties
- Save scripts to CRM server
- Publish scripts to CRM server
Screenshot

Download
it is published on codeplex
Ribbon Browser
You will be able to:
- Display system entity ribbon definition
- Display custom entity ribbon definition
- Display Ribbon control attributes
- Display Ribbon control XML
- Save ribbon in XML file
The tool is released on codeplex
Screenshot

CrmDiagTool 2011
The features are the following:
- Enable/Disable tracing
- Zip content of Trace directory
- Open Trace directory
- Generate diagnostic file in text or html format with components selection
- Enable/Disable DevErrors
Some screenshots:




Regarding source code: As the previous version had not its source code released, this version does not too.
Download link
Searchable Property Updater for Microsoft Dynamics CRM 2011

I posted the tool, the source code and the documentation on codeplex. Use the link below to access to these files:
http://searchpropupdater.codeplex.com