1) http://www.oneminuteleft.com/mb.html
(i really do love the style and graphics, pretty nice layout and all necessary functions installed)

2) http://www.midnightcafe.com/
(wow, great layout, very nice graphics and a very nice site 'around' the ubb)

3) http://www.whoisvan.com
(quite impressive way of using an ubb with an own style of graphics and color-scheme)

best regards,
chris
http://technoforum.de

p.s. there's no UBB in the spotlight which blows my mind