WebProvisioned web event - Feature Stapling - sharepoint 2010

WebProvisioned web event receiver -allow to add new additional logic when a site is created-is a new receiver type in SharePoint 2010. This operates at site collection level only.

<Receivers Scope="Site">

You can specify scope to "Site" or "Web" & acoordingly receiver will act SPSite.EventReceivers or SPWeb.EventReceivers

Feature Stapling -allow to add new additional logic when a site is created- will affect whole farm.