SD card image has now been reinstated and is hosted through mega.co.nz, I'm still not sure what the daily/monthly bandwidth limitations of this new site are (can't find info for the free account) but hopefully it won't get blocked. View the SD Card image post here.
I received an email from Dropbox today telling me that all of my public links were suspended so in light of this I can't host the SD card images there. Since I depend on sharing other files with clients via dropbox I can't risk having my public links blocked again. I'm going to try and figure out a way to host them somewhere though or failing that start a torrent file.
I apologize for the inconvenience this may cause anyone, worst case you just have to follow the manual instructions which is actually better since you'll learn more :)
Work is still crazy and with the holiday season I don't have really any free time to dedicate to this so don't expect much until the new year.