I think that at the moment it seems as though Nintendo are going to have a fairly thin lineup of DSiWare and are looking for third parties to take up the slack, just as with WiiWare. Unfortunately, they don't seem to have got many third parties on board for the launch period so all the US - and Europe - are getting are the few third party games that were ready with Nintendo filling in the gaping holes with the small selection of games and apps they've got available (and that translate easily for a Western audience).
DSiWare in Japan has slowly improved and I imagine that the same will happen in the West, but there's no denying they've handled the launch period badly.