hi there!
another satisfied user here. I have just one request. please consider adding "Perspective cropping" feature to the Crop tool. it is very useful when one needs to crop photos from conference slides, photographed documents, etc.
examples of the use can be found at:
or
http://www.diybookscanner.org/forum/viewtopic.php?f=3&t=416#p6017
thanks and best regards from Bratislava, Slovakia!