Garmin has posted version 2.60 firmware for the nuvi 660. I've downloaded and installed it, and all appears well. I know some of you had experienced problems with the previous update (stuttering voice prompts), but this one looks pretty solid. Seems like a fairly significant update -- a lot of bugs are fixed, so I'd recommend installing it. Only available via Garmin's WebUpdater application. More information available on Garmin's site.

Changes from version 2.40 to version 2.60

• Added SMS/Text Messaging support
• Improved shutdown sequence when disconnecting the Nuvi from the computer.
• Show ferry lines on the map.
• Fixed problem with some help files not showing up.
• Improved support for USB mass storage on Macs.
• Centered battery gauge on screen locked page.
• Fixed lock-up selecting traffic provider.
• Added '-' to edit phone number keyboard.
• Fixed browse map to display correct colors in night mode.
• Added 4GByte SD card support.
• Fixed possible file corruption.
• Changes from version 2.00 to version 2.40:
• Select Language Page string corruption
• FM Frequency page not in sync with Quick settings page
• GPS starting location not being saved properly
• Memory leak in bluetooth setup page
• Changed saftey camera tone rate
• Traffic receiver missing message error
• Increased Backlight at power on
• Increased touch size for Traffic icon on map page
• Improved large phonebook sync
• MP3 playlist support (m3u)
• Added Estinonian and Romanian text languages
• Added Greek, Croation, and Slovenian voices