Mine is only really a showcase. It needs updating, as well. I leave the downloading up to in-game or HTC's web link here:
http://www.hitechcreations.com/download/skins/index.htmlI think lumping by artist is a bit elitist. Maybe that's too harsh a description but I can't think of a better word at the moment. I know, I know, you just want to get all of "artist X" but they list the names on the download page I linked above. You can also download these through the AH skins catalog which has screenshots and links to the HTC downloads for each.
IMO takes a bit of the focus from the nice looking skins and places the emphasis on the name attached to the skin. Some folks skin better on a certain type of plane vs another, also. Might like their US planes but not their Japanese for example. Everybody has their areas of expertise.
In general response, though, I would say it's not going to happen. After the headaches with the previous downloads, leftovers as skins are redone, remodeled, swapped out, I don't see HTC making downloadable "packs" regardless of what you put in them. They seem to have gone a la cart as far as skins downloading due to the system performance hit you can receive when running with all skins in-game.