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I agree with ZYbr. There's a ton of basic information on that Hugo site, and it's all presented in a good, consistent style. Plus, you can find tips on logistics and upgrades there.
But... I'm talking about something completely different! :)
It's one thing to have information scattered in different places, but it's quite difficult for one person to compile it all into a cohesive whole (just think about inserting images into cells, creating links, etc.).
And sending your work to one person who's working with Excel is a lot of wasted effort, if you don't mind me saying so. That person can easily find the information themselves, but putting it all together is much harder.
That's why I'm saying - let's create a main file with outlines of sections and topics. Then, everyone can download it and fill in a specific section, working directly with Excel, and send their part of the work to a coordinator who will put it all together.
Question: who will take on creating this initial file? I can try. I won't brag, but I have some basic skills in Excel, thanks to a year of computer science at university.
In short, I'd be willing to take on the whole thing, but I thought the work had already been going on for months. Now, we just need to find a few people who REALLY know Heroes 4.
But I still suggest making Lu41k the coordinator. I'm personally too engrossed in Heroes 5 right now; I haven't played Heroes 4 in about a month. :)
Question for Lu41k: can you handle Excel? If you're interested, I can create my own version and you can evaluate it.