Seriously- not that big of a deal. It happens- regardless of how careful you are. Now I know it may seem innerving, but calm down- the sensor is not as fragile as others may tell you.
First and foremost- don't use the Delkin air- check out the reviews and see the amount of people that complain about the crud that those leave on their sensors- this will basically create more work for you, and will force you to get the wet kits.
Get a Giotto's RocketBlower- they run about $15, and are a vital part of any kit (for cleaning lenses, sensors, viewfinders, whatever). Try running the camera on sensor clean (or whatever mode locks up your mirror on a Nikon), point the camera down (a tripod will be helpful), and blow away. Unless you jam the tip of the blower into the sensor, there is nothing that will happen to it (and in fact that is the recommended method for cleaning in the Canon manuals (I'm thinking it should be the same for Nikon)). This will take a while, and is not aways successful- it took me about 4-5 rounds until I got most of the crud off. The problem with this method, is that it's only a temporary solution, and the dust will eventually come back.
Recently I got myself an Arctic butterfly 724 (slightly more expensive than the one that seenew suggested, has higher RPMs, and a bigger head), and dust has seized being a problem for me. It takes seconds, and will attract most of the dust on that glass cover, getting it out. I would probably avoid getting a wet cleaning solution unless it becomes necessary. Others here will certainly swear by the swabs, but for now, I like my dry cleaning method.
If you're short on money try the blower- if you have that C-note, get the 724. To quote Dennis Miller- that's of course my opinion, I could be wrong.