First of all, THIS IS IN THE WRONG FORUM, GENIUS.
Second, they still appear in the forum as "Moved: Whatever the topic of the thread was," so you can still find them. On EYKIW, there's "Moved: Which band would you prefer to support U2," for instance.
Then when you click on the thread, you get a little trail of breadcrumbs at the top of the page. Continuing the example, "U2 Feedback » Your Blue Room » U2 Vertigo Tour Central 2004 / 2005 / 2006 » General Tour Discussions » Which band would you prefer to support U2." So it's really obvious.