Is your listing on the index cached or not? And have you noticed a change in pagerank?
To be honest, Google's index has been all over the map lately. I know tons of people who've been dropped out of the index entirely or can't for the life of them find themselves in the directory i.e. are possibly so far back in the listings with any given query that they might as well not even be in it.
Until things kind of sort themselves out at Google during their current update phase, I think anyone would be hardpressed to really know what's up over there. =/