So, what does Multi-Site Manager provide?

• You upgrade Sitefinity once, and that upgrade automatically applies across all your sites.
• You can share templates, news items, events, and blog entries across all your sites. Of course, you can limit blog entries or events to a single site if you want.
• You have a common single back-end experience for the content editors. This means that any updates you make to the WYSIWYG editor or instructions are there for all your editors.
• If you add or upgrade your widgets, those changes are immediately applied to all your sites.