I'm running Liberty Rom (Gingerbread) on my Droid X so it's pretty much stock Android, though I tweaked the colors a bit to make it faux ICS. You probably know most of these apps, but I'll highlight some that I think are interesting.
- doubleTwist (https://play.google.com/store/apps/details?id=com....): My favorite music player on my phone at the moment. Functionality wise, it's almost as good as my Zune HD (don't hate) and the design is pretty fantastic. One of my favorite things is it has built-in podcast support, so you can search and listen to podcasts direct from the app.
- Flipboard (beta): I never got into Flipboard on the iPad so I wasn't too eager to use it on my phone, but after using it for a day, it's definitely become one of my favorite apps. I think the way content is displayed is better than the iPad version and it works really well when browsing all your social networking accounts.
- Epistle (https://play.google.com/store/apps/details?id=com....): This is a free, super basic note taking app. I have it synced to my Dropbox so I can have access from any device. What I really like about it is that it continually saves. I can jump in the app, tap out a note, and then lock my phone. No need to hit a save button.
- QuickPic (https://play.google.com/store/apps/details?id=com....): An awesome image (and video) gallery app that is way faster than the stock gallery, at least on Gingerbread. If you played around with a lot of photo apps, you'll know the pain of having your pictures saved in different folders on your phone. With QuickPic, you can include or exclude folders that will show up in your gallery.