I have read that the 'imgur' T&Cs are identical to those of PB. So it is possible that with time, imagur might start to charge for 3rd party hosting.

I registered with 'cubeupload', and uploaded a few images, but I'm having difficulty downloading.

I would like to register with 'flickr' as they are a well respected hosting site for professional photographers, and thus permit 3rd party hosting - but the registration page just presents me with three boxes without saying what you have to enter in each. Can anyone help?