Well, I have tested some applications and none worked, the applications are:

Fring: The program starts, it shows the fring logo then it shows the springboard again.
iPhoneVideoRecorder: Same as fring.
Chess: Same as fring :'(
Terminal vt-100 ver 296: Same as fring.
Installer: Same as fring.

Then I got tired testing programs.

Now there are 2 different folders for applications, the first one you certainly should know is the /Applications/ folder, the new one is located at /var/mobile/Applications/ where I presume is used by the appStore to put applications that you download or buy. If you try (just as me) to upload homebrew applications to the /var/mobile/Applications/ it shows a white icon but still don't work. I hope someone find a turnaround for this issue.