Flickr have recently introduced a 'new' system. Flickr members at present can choose to use the 'old' or the 'new' system. The new system using a completely different linking method for members wanting to link their photography into Ausphotography.
The new system does not require a link-back to the users flickr account.
I have now updated our Flickr: How To so that it at present has instructions for both the old and new methods. If anyone finds an error in my linking methodology, please let me know and I will fix the tutorial