Complete BlackBerry Secrets Blog

Hiding unwanted or unused BlackBerry apps and services doesn't delete them from your device altogether, but it does put them out of sight. If that's good enough for your purposes, this could be the better option, since you won't have to hide the icons every time you reboot.
To hide an icon on your BlackBerry simply scroll over it, click your BlackBerry Menu key and choose Hide from the list of options that appears. That icon will then disappear from view until you hit the Menu key again and choose Show All. This will display all "hidden" icons, though they'll still look "grayed-out" to signify that they're hidden. To hide all those hidden icons again, uncheck the Show All option in your BlackBerry Menu.
Related : How to Remove Carrier-Supplied Apps and Services