Here's a selection of current interesting news and articles:
Mitch Milam has released a free tool to extract CRM 4.0 plugins registered in the database and upgraded its CRM Migration Assistant to version 1.1
Rhett Clinto has enhanced its Metadata Browser with an export to excel function.
The CRM Software blog has an interesting article on how to include a webresource in the MSCRM form header.
Customer Effective explains how to implement a wysiwyg text editor into a crm textarea.
PowerObjects has a nice trick to use non supported filetypes in ressources (ie: flash files in that case).