1) I absolutely love being able to run inspections in background, and especially being able to see CPU usage of 185% when doing it (dual cores). I love it so much I want to always run inspections in background. Unfortunately, there doesn't seem to be any way of doing that.
2) Shelve changes simple doesn't work yet. I get ".iws/.ipr file was changed in background, do you wish to reload" every time I try, but no other changes. This is sad, because the patches stuff seems to work well, and I was assuming that "Shelve Changes" was a simple combination of "Create Patch" + "Rollback Changes".
3)Drag-and-Drop Move is extremely nice, but it makes it even more important to make the Move refactoring module-aware. If you move a class betweem modules, IDEA needs to offer to Do The Right Thing, adding module and library dependencies as needed to keep the code from breaking.