I recently got one of those LensPens, and I have to say, it's pretty nifty! I was more than a little doubtful that they'd work, but it does quite well. I got the (somewhat overpriced) SensorKlear after experiencing some frustration with wet methods. The SensorKlear did a really nice job of removing the dust, although I did have to "recharge" the tip halfway through.
I'm going to have to buy a couple of LensPens for my lenses now.
So, I noticed that they try to sell you a loupe so that you can inspect the sensor up close. But I didn't buy one. I'm very nearsighted, so all I did was take my glasses off and I got a really good close-up view. It's like my eyes have extension tubes! LOL
It's amusing, because I've grown up thinking that my nearsightedness was at the very least an inconvenience, and at worst, a disability. Who would have thought one could have an epiphany while cleaning a camera sensor...?