This is certainly not a complete list of aquarium help/information, but these are ones I CAN vouch for their sources.
Admittedly two websites (Aquarium Article Digest and Aquarium Supplies & Resources) have cited/interviewed me among others as their source of information.
This does not take away their credibility, as I know one website in particular (Aquarium Article Digest) uses dozens of resources and even guest authors (whom I do not know).
The other websites I recommend are based on what I view as simple yet good information.
I should also note that I started this website only recently to counter all the misinformation I find via customers who make me aware there-of.
I am far from an expert in websites (as the amateur quality of the website design shows), and in fact I am rare online. Much of my time online is ONLY after I have a client tell me about the “lasted thing they read online”, for which I investigate.
For this reason I am not always aware of all the good websites either, only the “bad” ones I am made aware of by my clients.
Since this blog over all often has a negative tone based on the reasons I get online in the first place (to explore strange advice my clients repeat to me that they found online), I felt having a positive post about websites I can recommend was long overdue.
This article is especially excellent for its articles on lighting, such as “LED Aquarium Lights, Lighting Information“.
This article has a great listing itself of many top notch articles in this article: “Unique Aquarium Articles”
While not a flashy website, I found the articles simple and “spot on”
Great accurate article about the use of aquarium medications and treatments, as well as where to get them.
Again I found this website spot on with the article about Furan 2 interesting since this is a product I often find useful.
A client stumbled upon this neat little gem and told me about it.
I especially like this article from this website:
Aquarium UV Sterilizer Use; Choosing & Maintenance– This article includes simple but accurate information about choosing a replacement UV bulb
My Aquarium Opinions 
Top links for fish keeping both new and experienced!
If your looking for a store you might want to try Aqualife2u, they also have some useful tips, albeit it not as in depth as some of your links you already have on here