Ten points to Abishur!
There is as Liam says a polyswitch on each downstream USB port. On the beta boards they are clearly 140mA (hold current) devices. Are you saying that these are to be increased or removed on the production boards?
Otherwise, it would be good if admins checked their facts before "correcting" people, especially en masse. Readers will be likely to assume that what you say is authoritative.
Well I did preface my statement by clearly stating that this is what I remembered off the top of my head, and left it there until one of the people actually affiliate with the RPF could comment. So I did some more researching in order to give an authoritative response as requested. Using the x-ray provided to us of the final board:
You can see that yellow is the power. The power comes from the LAN9512 chip, stops by a coupe resistors and capacitors, then heads straight to the USB ports without touching the fuses. However, if you look closely it would appear that the red lines (which represents data) might go through the fuses, meaning that they're protecting the board from a sudden surge of power over the data lines or someone plugging in a home made cable where they got some wires crossed.
Now while I admit that the second half of that, the part about the data lines, is my personal speculation. The first half is an authoritative statement. You can clearly and unmistakeably see that the fuses do not interfere with the power being sent to the usb ports.
We admins don't say things authoritatively without checking our facts first, please don't go around accusing us of doing so and encouraging the spread of misinformation. As with all things where the hardware of the r-pi is concerned, I am not where the buck stops. Gert or Jamesh are where the buck stops and I never mind them stepping in and correcting anything I have to say.
Dear forum: Play nice