This is just a little tip, but sometimes they are the ones that help people the most.
I was trying to figure out how to add the new SharePoint 2010 Media Web Part to a page. No matter where I looked in the list of available Web Parts, I just wasn’t seeing it. Blog posts from smart people like Chaks’ (@chakkaradeep) SharePoint 2010: Media Web Part and others said to simply add the Web Part to the page, configure it, and you’d be all set.
The missing piece was that you have to have the SharePoint Server Publishing Infrastructure Site Collection feature activated. This feature is only available in SharePoint Server 2010, so you won’t see it in SharePoint Foundation 2010.
Once you have the feature activated, you have two ways to use the Media Web Part.
The first way is to insert the Web Part into a page from the ribbon. When you click the Video and Audio button on the ribbon, the Media Web Part is inserted into the page wherever you’ve left your cursor.
The second way is to edit the page and add the Web Part, exactly the way you add other Web Parts to the page.
Once you’ve followed either of the above steps either you’ll be able to access the contextual buttons in the ribbon which let you set the properties of the Web Part.