in reply to Random User Node
here's my simple idea:
add an option to the new and improved Super Search to have it choose a random node from the results and redirect the user there. this is sort of like Google's "I'm feeling lucky"(TM) search feature, except that a random node is chosen instead of the first one.
alteratively, in conjunction with more general sort options on Super Search, you could have exactly Google's "I'm feeling lucky"(TM) feature with a random sort option (with the effect of redirecting to the first of a randomized set of result nodes).
update: i forgot to mention that this only works with no search terms in the box and "User" nodes as the only search criterion.
update2: this proposal also naturally accomodates repson's proposal above. if another option to limit Super Search results by node length were added, it would accomodate one of damian1301's suggestions as well (avoiding empty nodes).