A new property has been added to the TextBox control you already know: the AutoCompleteType property. What does it do? It let's you specify the field of a user's vCard to automatically populate the TextBox. Take a look at the following form:
The user must type in the name every time she is on the form. Tedious. No longer if you assign the DisplayName vCard attribute to the TextBox:
Now, if you had typed in your display name in a different form already, it will automatically pop up as a choice when filling in the form:
The screenshot already implies that this is a cross-browser feature, the generated HTML source code does indeed confirm this assumption:
<input name="txtName" type="text" vcard_name="vCard.DisplayName" id="txtName" />
Yet another nice feature of ASP.NET 2.0 to look forward to.