"Is there some sort of "tutorial" that teaches people what is the best way to "package" freestuff for ease of use? I am thinking of putting out some free stuff, textures and such, and I want to avoid "pissing anyone off", so, what's the best way to package everything to make everyone (or most everyone) happy? "

There really isn't. Short of making sure your zip paths start with "runtime" and not using "!" to put your files at the top of the list, anything you do will have someone wishing you'd done it differently.

This isn't to belittle anyones comlaints but it really isn't feasible to make everyone structure their files (freebies or marketplace items) in a way that only refers to the object. What reference is there to use? Daz?
"Vanity" folders take care of generic file names overwriting other generic file names. It makes looking something up based on who it came from much easier. Personally, I put textures in a folder with my name and a sub-folder that refers to the clothing item it was created for. I also start my Mat files with "MAT_...". It just makes sense to separate a mat file from a pose file. If I'm wrong, I'm wrong but all readmes state where everything is and what they refer to.

I seem to recall not too long ago one of the main complaints was generic files and not knowing whom they belonged to.

...... Kendra