Thanks for the feedback. I think adding another update button below the tag sliders is a good idea.

As per the "more natural way of updating results", I might use Ajax to plop in the new results when any search options are changed.. though this could lead to further complications: Currently you can click on a tag to add it to the "include" and "exclude" tag filters. If you click a tag and suddenly the results you were looking at abruptly disappear and reappear, it might not be so nice.

What do you think of this idea: Any time a change is made to the search options, the "update" button starts glowing (fading in and out or changes colors) so as to notify the user that it wants to be clicked?