Well, we all know that acquisitions are often reflected badly in the acquirers sp, so lets not get too over excited. I would think that we are looking a little longer term for the benefits for this (if it comes off) to show in the sp. My guess would be H1 2006 when the integration is complete and any redundancies are out of the way.
I would reckon that the only reason we would see an immediate boost would be if the city considers thus to have picked up YC for a bargain basement price.
Having said that, I am glad to have picked up a few yesterday and am on the bid for more today.