When possible, filters in my config replace the ads/junk with hidden text. Using the "toggle kills" bookmarklet will make them appear. The benefit of the bookmarklet, is that you don't have to enable/disable "Inject Style Sheet: Show Kills {2.a.in}" and then reload the page to view/hide the kills.
To use "toggle kills" you need either IE6, Opera7 or a Mozilla based browser.
Bookmark or drag the "Toggle Kills" bookmarklet to your toolbar.
Now that you have it installed: When on a page click "toggle kills" to display/hide the various Proxomitron kills.