How to do it?
If you want to keep your applications for later simply copy them from the above listed folder to your pc or mac.Best Practice:
Download all your needed application from this website using your pc browser:
http://appulo.us/appdb/
Then copy the downloaded applications to /private/var/mobile/library/Downloads
open Installous on your iPhone, click on Downloads you will see your downloaded application there click on it and then click install.
Although there is an option in installous to sync with iTunes, and it did this, but removing it from your iPhone to get it back from iTunes will result an error thus you have to reinstall it again using installous.
Still I need to check if when there is an available update will the iTunes update those apps or will overwrite the cracked application?