-crack.cd uses clamav to precheck viruses so it can be cosidered as clean
(there are modified cracks but it warns you)
-the most typical modification is changing crack.exe with a sfx rar file crack.exe and it installs ist.exe(ie toolbar?)
-making a general program that checks the consistency of your crack may be a good idea so someone can get the check program from your site and check the crack from the crack site