About a week ago Mediumgauge has updated PSP Filer, which is a file explorer with a bunch of extras.

Changes:

picture viewer:
– fixed a bug that Filer was crashed when reading picture in background at low memory.
– made scroll speed faster whie reading picture in background.
– added a feature to jump to the edge of the picture by pressing START with left, right, up and down.
– enabled to move next/previous picture while reading picture in foreground.

http://www.geocities.jp/mediumgauge/