For years now Smartmouth has been making it easy for BlackBerry users to add Hebrew fonts and keyboard to their BlackBerrys. Previously you had to reload the OS with multilingual OS that included Hebrew. Smartmouth simply extracts the language files and makes them available for OTA downloads from your device. He let me know that he has now made the Hebrew files available for BlackBerry 7 devices. I have tested it on my Verizon BlackBerry Bold 9930 and it works like a charm. He also has downloads available for other OS versions and devices.
Check it out at: cheservices.com/blackberry/