We have some consultants in for our Plumtree implementation. They were looking at some of my code and saw that I got intelllisense when putting in an <asp:repeater> tag. They were wondering why they didn't have such luck! After looking around...we found that since they are so accustomed to developing portlets within Plumtree that they don't have the "@ Page" directive at the top of the page nor did they have <body> tags around their HTML code.
Ding, ding, ding. When they added both they now have intellisense. Giddy Up!