I just learned a new one last night...Cntrl+F repeats the last filter you applied (ok I know it's in the menu, but I never look there)
also Edit -> fill will fill a whole selected area, even if the pixels are all different colors, unlike the paint bucket which only fills one dot at a time if the area is all dotted (did that make sense????) I was doing something last night where every pixel in an area was a scattering of black and white, and I needed to fill the whole area white...the paint bucket would only fill individual black pixels, because they weren't next to other black pixels, but the edit->fill command filled the whole selected area...
You all probably knew these anyway, but I figured I didn't until last night so maybe someone else didn't too
