Armadillo/SoftwarePassport: One of the best packers I've ever seen. It has lots of protection abilities, copymem, creating child process, debugger detection, time-limit, and so on.
Aspack/Asprotect: Some other good packers. Aspack is easier to defeat, Asprotect much harder, it has checksum protection, debugger detection, time-limit features. Recently, they have released Asprotect SKE Edition.
Softwrap: Here, the protection scheme is explained, but a demo version is not available. Or at least I haven't seen any. This has 2 files, a loader and the locked EXE file, which is encrypted. Earlier versions were not secure for software, I wasn't able to test new versions.
Petite: Another EXE/DLL packer. Can only mess up with imports, relocs and sections, has checksum protection. At least in the standard version which is free. There are other 2 versions which can be licensed until you die
PeLock: This one is also commercial. But even the demo version has good features, it only creates a demo popup when creating packed files with it. Can detect debuggers, breakpoints, has antidump protection, and so on.
Some others:
Shrinker
WWPack
If I missed any other PE packer/crypter, feel free to add.
Have fun...
