3) Sure, but isn't it nice to have everything embedded?

If the domain is your brand, then yes. I have worked for quite a few companies in the past, though, that could not understand that a brand and a domain name are not the same thing. In your case, however, it is.

4) Sorry, I'm just a german, had to translate but couldn't catch this sentence right...

Archeon pretty much summed it up. I have worked for dotcoms in the past (as in companies with ".com" tacked to the end of the name). My last experience of working for a dotcom was being escorted out of the building with the rest of the staff by the local Sheriff. After all, all dotcomers were criminals, right?

Is the rowi bird popular? I'm quite sure I'm the only german who knows it... How did you knew about it?

I imagine only in New Zealand. I only knew about it because of a past discussion with an ornithologist friend of mine.

Anyway, feel free to do what you like with that logo. I'm pleased that you like it. If at the very least, you can use it for a launching pad for other logo ideas.