After completing a MOSS 2007 SP2 to SharePoint 2010 (Enterprise) upgrade all seemed to go well. However, I soon began to notice some subtle differences between site collections. For example, the home site collection was missing the new Tag Cloud Web Part. So I seemed like perhaps a Feature wasn’t Activated. After a little digging I learned that there is a Feature called Portal Layouts which is responsible for provisioning artifacts like the new Tag Cloud Web Part.
To Activate the Feature you can use either stsadm or PowerShell. The syntax for both is listed below:
stsadm -o activateFeature -name "PortalLayouts" -url "http://<SharepointServer>/sites/<SiteCollection>" –force
Enable-SPFeature FeatureFolderName -Url http://server/site/subsite