So RIM, anxious to get into the tablet game and paranoid they would lose critical market share, rolled out a device with only short-range WiFi connectivity, a goofy scheme to bridge to a Blackberry for access to the Internet through a carrier, and essentially no applications software.

FORBES: The Amazon Kindle Fire May Kill The RIM Playbook

The 350 requires wired Internet (or a separate wireless bridge with an Ethernet connector) while the 500 has WiFi.

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As of now, the Ubuntu touch dev preview contains the shell, core applications, WiFi networking, support for front- and rear-facing cameras and Android Developer Bridge tool connectivity.

ENGADGET: Ubuntu Touch Developer Preview now available for supported Nexus devices