tedster - 6:08 pm on Jan 15, 2009 (gmt 0)
Seeing Google traffic up by 30% is a very good thing. I would not have major concern about the loss of sitelinks if search traffic goes up (especially well-targeted search traffc), but certainly do keep a watch on the situation. It sounds rather odd, especially that potential sitelinks don't show in WMT. If you haven't made structural changes to your site, this might well be a Google bug.