New trimmer is mostly unicode support and some tweaking to the gba part; I had problems with unicode files inside zips tho so had put it on hold for a while. Not sure there's much more that can be improved, even after so long it's still the most popular and everyone recommends it
Maybe the UI lacks a bit, but maybe that's also a good part.. simple, fast and straightforward. I added also an option to use a normal windows list control, but it has no transparency : (