Views 2 Conditional Filter How can I apply a conditional fitler to a view (using views 2)?

For example:
I have a view which displays the teasers for several different node types using a filter on Node:Type in [Blog entry, Forum topic, User profile]

This works well for showing all nodes of those types, but suppose I only want to show a user's profile if it has a picture as well (and all of the other types).
clone a display for the "filtered (must have picture)" view. 
Add a relationship on the picture field and make it required. This will limit the display of content to that which has a picture field populated. 

Now you can use a link in the headers to jump back and forth or provide another means.