Yesterday I posted an updated to the 7330 Speech Library, V1.3. This is an optional update that fixes the mispronunciation of the phrase "http://www.". It also includes an improved version of the letter "S". We have received several reports of "S" sounding like "F" in some cases and are making this fixed version of the letter "S" available.
You can find the updated library file on the 7330 Firmware Upgrade page.