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After many time-outs, I got on enough to get a test account. After many time-outs on the e-mailed link, I got signed in. Now I'm playing with it a bit, but my test upload has not gone through. Understandable if this really is the most successful 'start-up' of all time, and I would not rule it out.
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Update on Mega: Tonight, from my satellite connection (and BSD box with chrome built from source) I got logged in after about 1/2 and hour. This time I managed to get a 44 byte file uploaded. Took about a minute at 1 byte per second. So, it's 'working'. Sorta.
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Test/Update. Things are working better today. A long way from usable, but better.
If anyone is interested, here is a URL to an image with the key embeded. Optionally, up to the bang could be given and the remainder (the decryption key part) could be sent via e-mail (or, say, single sideband radio for instance.)
https://mega.co.nz/#!Z8tQgbpC!Nv3Hlnxlh6p7tl3jGPU5Rlgsw4w7Cl4OOPdsMnkjDOQ
At the risk of (further) spamming the forum, I just want to see if I could make this an image:

edit: another test:
https://mega.co.nz/#!Z8tQgbpC!Nv3Hlnxlh6p7tl3jGPU5Rlgsw4w7Cl4OOPdsMnkjDOQ