Options:

Forums
- DNN Forum* Search the forum on www.dotnetnuke.com
- ASP.NET Forums Search the "old" DNN Forum on asp.net
- Both Search in both Forums
- Other options Search in one of the specific forums
Dotnetnuke
- The Web Search the web for "Dotnetnuke OR DNN"
- DNN Site Search the Dotnetnuke website, but not the forums.
Skinning
- General Search the web for "Dotnetnuke OR DNN" AND Skinning
- XHTML Dotnetnuke and XHTML
- CSS Search for general info on CSS
- Javascript Search for general info on Javascript
Programming
- Module Development Info on Module development
- VB/C#- DNN Programming Dotnetnuke with VB/C#
- VB/C# - ASP.NET Programming ASP.NET with VB/C# in general
- Ajax - DNN AJAX in Dotnetnuke
- Ajax - ASP.NET AJAX in ASP.NET
MSSQL Server
- T-SQL Search for T-SQL
- Manage Find info on Managing MSSQL server
Free
- Modules Find Free DNN Modules
- Skin objects Find Free DNN Skin Objects
- Skins Find Free Skins
Various
- Hosting Find a DNN Hosting provider

Service provided by Timo Breumelhof, Dotnetnuke skinning team lead.
If you have any remarks / suggestions feel free to contact me.

20080524	Change page to XHTML
20080408	Changed the base URL for better results Thanks to Robax for notifying me there was a problem with the results!
20070702	Add Search in specific forum on dotnetnuke.com
20070603	Add Language filtering
20070530	Split Search option in two Add Forums > Search in both Forums Add Skinning > XHTML, CSS, Javascript Add Programming > Module development Add MSSQL > T-SQL, Manage Add Free > Modules, Skin objects, skins Add Various > Hosting
20070509	Add C# programming
20070510	Last Search option stored in a Cookie
20070508	Moved to www.searchdotnetnuke.com

*) note for the DNN Forum results:

It could be that a link leads to a forum page with no threads, this is caused by the forum module, it includes the threadpage in the URL.

This will only happen if you are logged in on the DNN site and have changed the number of threads per page.

Solution: Click the link to the thread in the breadcrumb on top of the forum.