On 1.0.0 (Ubuntu 10.10 using the s3tools repo), I occasionally get the following error when copying certain files:
WARNING: Retrying failed request: /myfile.txt (The read operation timed out)
The entire output is attached.
When I revert to 0.9.9.91-1 (the default in Ubuntu 10.10), the same commands work normally.
Others are experiencing the same issue, as per this forums thread: