Not sure if the Arashi community was aware of this or not, but MegaUpload has relaunched under a new name and website.
Now they are just called Mega.
For more information, you can check out the following link to the article which talks about their pre-launch from last week.
The new website is currently up and running now, so it looks like you can start uploading Arashi goodness to a more secure website once more. Enjoy! ^_^
New URL: https://mega.co.nz/