I am curious to know what kind of transfer speeds others are getting
when sending files over the USB connection to the Kindle?

According to Amazon, the Kindle uses USB 2.0. However, I have
experienced very slow data transfer rates when transfering files over
the USB connection. For example, I transfered a 50 MB mp3 and it took
10-12 minutes. I tried this from a PC (running Windows XP) and from a Mac (running OS X 10.5 and another unning OS X 10.4) with similar,
slow results. I have also transferred the file to the built-in memory
and to an SD card. Again, same slow transfer speeds in both cases.
By way of comparison, I transfered the same mp3 to an iPod and it took
about 10 seconds to tranfer.

I contacted Amazon Kindle support and, after checking with the developers, they reported back to me that the transfer speeds I am seeing are as expected for the device.

I'm not very happy with this answer as these speeds are worse than you would get with even a USB 1.1 device.

I asked this question on a different forum and one owner reported that he was able to transfer 50 MB in about 40 seconds. It seems very strange to get such a wide variance in transfer speeds for two different Kindles.

I would be very interested to hear from someone who is getting faster transfer speeds.

Thanks for any input.