Armadillo, SVKP or Obsidium.

Still have to check (don't have money now to buy them) PC Guard V5, Ac Protect and XTreme Protector.

UPX, ExeStealth and AS Products are no more secure...at the moment exists unpackers for all versions.

There are other protections that seems to be not used bu authors.

SMARTE Secure (Ex-Softlocx/Titanium)
Interlock (only used by Installshield)
Software-Shield
Visual Protect

Do someone has informations?

Anyway I am trying to develop some applications and currently I do like this:

Upx+Aspack+PC Guard 4.10 OR
Upx+Aspack+Armadillo
Upx+Aspack+SVKP
Upx+Aspack+Obsidium

Then i modify sections names(if present, cause the first case strips away all names) just to mess up some things.

Anyway I program as a hobby....try to do the best but just as a hobby....so protecting is needed only to try to exactly know who is using when and what, not for earning a lot of money.

Anyway I protect each program with different protection systems so a "serial cracking" (mean all in one) of my programs is not possible and use a totaly different serial scheme for each product. But as i said before is only to track uses of my program.