FSG - F[ast] S[mall] G[ood] is a perfect compressor for executable files, its decompression code is only 158 bytes long, it's compatible with Windows 95 / 98 / ME / 2K / XP / Vista / 7.

features:
+ designed for asm executable files (kg, cracks, trojans :)
+ small loader size (but if u know how to improve it, mail me)
+ imports handling
+ support for executables with export tables
+ TLS support (delphi, bcc exes)
+ overlays support (flash, director, shockwave etc.)
+ aPLib compression (LZMA is too big and NRV from z0mbie's site is soo sloow)
+ command line support, eg. fsg.exe notepad.exe (drag&drop also works)