I use Photoshop Elements 9 and own 10 but haven't loaded it, as my HD is pretty full. I'm happy with 9, though, so not in a rush. I also have My Digital Studio and am trying to get familiar with it since I host the digiscrap progressive challenges and quite a few digiscrappers on SCS use that program and I'd like to be sure the challenges I post are fun for both MDS and PSE users. A few people use other programs too, but the above 2 seem to be the most popular here.
I also used to be a Stampin' Up hobby demo and, who knows, if I get to know MDS well enough, I just might get back into being a demo and helping customers become familiar with MDS. PSE will always be my #1 go-to program though because it does so much!