We just got that last one but haven't been able to advance!

Welp. Brute-forced and got all the single-word answers, but some of the answers are multi-word.

4a) bgure.ugz

4b) bagureha.ugz (Pink Floyd!)

5a) vgevrq.ugz

5b.1) ohevrq.cat

Just FYI, the filename extension can be omitted. E.g. http://lowercase.billyjanitsch.com/one

for the one after that, you need to fix the grammatical mistake, and the typo.

- hey, ninja'd by an edit! -

Next one has a hint (but I haven't gotten it yet... my first guess takes me to nowhere special, PNG, as far as I can tell... trying variations on Flores etc. aren't working)

yeah, I'm stuck on five:a.

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buried.

7S144E

<!-- greenwich -->

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That position, 7S, 144E, appears to be in the Marianas Trench, just south of Papua New Guinea. "buried" contains similar enough letters to the previous answer, that I'm assuming it's related in some way, but I'm not getting anywhere. Need to step off for a few minutes and let things clear a bit.

It's in PNG, not south of it: https://maps.google.com/maps?f=q&source=s_q&hl=en&geocode=&q...

Ah, duh. And I'm giving hints before I myself realized the answer.

How many red fish are there?

Just got it, finally! Gotta check your assumptions.

Indeed - just got it!

oh wow, no doubt! Tricky move, sis!

I don't get it. I got as far as PNG and am thinking along a buried "."

You're quite close, but not in the way you think ;)

I wonder how far people have gotten. For me:

5b) fur 6a) natyr 6b) natyvn 7b) nqnz 8a) cebqhpg

Is there an obvious trick to 8a that I'm missing? I've been staring at it for longer than I'd care to admit...

Edit: by "8a", I mean the puzzle that leads to 8a ("get out your notepad")

8b) cebhfg

I guess that's it. And fun times were had by all.