EPiServer 7 brings a lot of changes and a new editorial UI. Meanwhile the API is said to be backwards compatible. I've investigated the upgrade experience and found a few interesting things.
By limiting available options to only valid values for PageReference and ContentReference properties in EPiServer 7 we can improve the user experience for editors. By doing so we can also protect our sites from invalid and potentially harmful editorial settings.
Channels in EPiServer 7 is an exciting new feature that can be used for a variety of purposes. While it may not be the first use case that comes to mind we can use channels to enable rendering of pages on a site as PDF documents.
The PropertyFor HTML helper handles a number of optional parameters for specifying tags and CSS classes. As they are specified using an anonymous object Intellisense isn't much help. Here's a reference of the options available.