The other day I upgraded to Ubuntu 11.04 alpha to see if it might fix the problem - it still occurs as expected.
I have also tried a fresh install of Fedora 14 and get the same issues.
@David - What command did you pass to wondershaper? I have tried with little success - any arguments I seem to give it limit my download speed to about 20kb/s, which has painful consequences given my home partition is mounted over NFS...
All I want to do is import my photos to Shotwell :'(