Currently, the action=index function produces a not very pretty list. Two suggestions to make, one trivially easy, one not quite so.
Helmut Leitner has made a very pretty index on his ProWiki?. Check it out. You'll love it.
See: http://www.wikiservice.at/prowiki/wiki.cgi?action=index
-- DavidB
GyPark has made a similar index on his UseModKr:
See: http://gypark.pe.kr/wiki/action=index
-- JuanmaMP