SP2010 - List improvements

Quite some things have improved for lists in SP2010. Some of the improvements are:

transactional cascading deletion (and restriction of deletion)
In the list settings the will be an option to enforce relationship behaviour. This will have 2 options: rerstrict delete and
cascade delete.
1. When an item in the target list is deleted cascade delete will delete ALL related items in this list.
2. Restrict delete will prevent the deletion of an item in the target list if it has one or more related items in this list.

formula based validation
In the list settings you will have the possibilty to select a field and enter a formula for validation. The formula
"=len(Lastname)=30" for instance will limit the name for the Lastname field to 30 characters. Another nice feature
is that you can also fill in the error message that will be displayed to users. Fantastic, isn't it!!

lookups to multiple columns
What else can I say but: sweet!!