SharePoint 2007 site templates not appearing into SharePoint 2010

I have came across situation in which after MOSS 2007 to SharePoint 2010 migration – site templates are not appearing while creating new site in 2010, then I have figured out that .STP (site template file) concept has been removed in SharePoint 2010, so for saving any site template in 2010 we need to save file as .WSP which will automatically save solution to solution gallery page and then we need to activate that site template to be appear while creating new sites in SharePoint 2010.

Here are some reference link which talks about how to create site templates in 2010

http://www.learningsharepoint.com/2010/06/20/moving-site-template-stp-files-to-sharepoint-2010/

http://collab.rdacorp.com/2010/01/sharepoint-2010-custom-site-template.html