Upx is an executable file compressor. The interesting thing in relation to the b-f or d-i is that it can compress bzimage linux kernels. The kernel is still bootable, and a coworker shaved 100k off the size of an existing bzimage (even though it was already compressed). http://wildsau.idv.uni-linz.ac.at/mfx/upx.html (i386 specific though for now.) -- see shy jo