Please post links to any walkthroughs you might find!

I found a let's play: https://www.youtube.com/watch?v=yxPgX2VP0rs

And a video walkthrough: https://www.youtube.com/watch?v=6hCA49mW3XA

No clue if this is accurate or any good but for those that prefer a written walk-through (this one also includes some Lets Play video clips as well).

http://www.dtgre.com/2014/04/ether-one-complete-walkthrough-pcmac.html

This "walkthrough" is well nigh useless. Apart from the broken English, the descriptions are so terse and context-free as to be unusable. It also appears to ignore virtually everything in Pinwheel Village.

I don't recommend it.
On a more positive note, I found this YouTube playlist to be helpful:

http://www.youtube.com/playlist?list=PLEfCxj7duOlrEd1aIMHFNAn2-BHtEbPgc

Excellent! Thanks for the update ;-)

I'm not looking for the walkthrough, but a little hint: I'm down the harbour and unlocked the passage to the industrial area, but I managed to restore only one projector out of four in the harbour. Are all the clues for projectors already located down the harbour, or will they show later in the game's next areas and I will go back to the harbour to restore those projectors?

The solution for each projector is contained within that area. In fact, the solution, along with the objects you need, can almost always be found within that same building or general area. You don't need to store items, but sometimes an item picked up in a previous area will make your solving a new puzzle easier, even if that isn't necessary.

In short, you never need to travel to area B in order to solve a puzzle from area A. Just look around the projector a bit for clues!

Thank you very much, both of you! :)

That one was actually obvious – after all, blackboards have only one purpose. :) The puzzle in the pub had me stuck for a long time, until I realised I could write on the poster. It's not immediately apparent because IIRC there's no writing cursor, so try clicking on various documents to see whether you can write something on a line or in a blank space.