BlackBerry is a brandname for a PersonalDigitalAssistant that had a phenomenal growth in popularity, partly due to its good on-the-fly email and WirelessSecurity features. See http://en.wikipedia.org/wiki/BlackBerry
Some of the features of this unit require subscription to specialized BlackBerry services.
The device uses a proprietary operating system but there are JavaLanguage based models. Comments were made that this helped BlackBerry SecurityManagement features stand out amongst competitive WirelessDevices.
Fallen King of the SmartPhone
I looked at a mid05 glossay for a BlackBerry model 7100g. It claimed email attachments can be downloaded and viewed, including graphics, PDFs, word docs, etc. It also supporting viewing of HTML (and WAP) web pages. I am impressed.
Resources
FAQ in BlackBerry forum at http://www.blackberryforums.com/faq.php
US Airport using BlackBerry for security checks at http://www.cio.com/archive/081504/tl_security.html?printversion=yes
Squeeze on BlackBerry at http://www.businessweek.com/print/magazine/content/04_49/b3911084_mz063.htm?chan=tc&