Yesss!!! I've been trying to make games with RPG Maker for like 3 years now, but I constantly get discouraged because I can't make them how I want to without knowing how to script. I have been trying to learn to script off an on for the past couple months, but it explodes a mere mortal's brain. To be honest I feel like I haven't learned anything. Maybe I will finally be able to learn because of this. I'm looking forward to this a lot!!
I can't contribute but I can sure tell you what I personally would like to learn/see:
1) I'd like to see your site have an easy upload feature so anyone that is good at scripting can quickly and conveniently contribute their own help videos and text to one of several specified teaching categories. I have absolutely no doubt that you alone will provide a lot of useful information, but imagine if the other good scripters out there had a quick and easy upload tool...there would be a lot more help for newbcakes like me

2) RGSS2 first and foremost. I honestly don't care much about the other stuff. Maybe ActionScript.
3) I'd really like to learn what the default RMVX scripts mean - what does what in the program's default code. For instance, let's say I want to make a special character select screen with a script. Well to a beginner like me, I don't even know what part of the default code in RMVX controls the stuff that I need to modify. In my opinion, teaching the default code would go a LONG way toward helping everyone interested in writing scripts for RGSS2, and would at the same time teach them about the ruby language in general. So maybe one category of the site could be devoted to teaching default code and why it exists, what it governs, and how to modify it.
4) First off, I'd like to understand the step by step process in general terms of how to create a script specifically with RGSS2 in mind. One thing I can't seem to understand is if there is any general layout to follow, or if it's so complicated that there IS no general layout, and every script has a completely different "skeleton", if you will. Perhaps just create a really basic script and explain line by line why you're writing that line, and what it means, and why you have to do it. So maybe one category of the site could be called "Hands-On" where people actually create various simple scripts during the video and teach people why they're doing each thing.
5) Let's say I was someone else who actually halfway knew what the heck I was doing. I'm sure I'd be interested in somewhat more advanced topics like how to make your scripts compatible with other scripts and know where to put your scripts in the Script Editor in terms of order with other scripts.
Well, that's pretty much it. I don't know what an already advanced person would need to know, so I can't help you there! But seriously, best of luck to you! I'm really excited to see this!