1) Yes. Well, honestly, I thought the layout and descriptions were nicely organized, and detailed enough. I have to agree with Pyrazor, setting out the overall framework would be a good start.
2) Yes. Again, in my opinion, any information is good information, so no complaints from me.
3) Staying with Windows is fine.
4) I for some reason have been put off by XNA. I can't really explain why. For some reason I enjoyed using MDX, and have found a library called SlimDX to continue experimenting with. However, if you continue developing with XNA, I won't be heart broken. Please stay with c# for the series, I enjoy that language so much.
5) Sure, I'm open to all, except VB, can't stand VB.
6) I personally enjoy the .pdf format you have used prior. Although plain ole text on the forum would be just as good.
7) Stick with the engine. It's a Zelda based site, so I'm guessing most people are interested in building a Zelda styled game.
8) Mainly good practices. Learning how to manage resources, and building an efficient 2D game engine that is generic enough to add on to.
9) I really enjoyed the series leading up to your absence, so nothing to speak of.