For whatever it's worth, "jaghead" doesn't show up in the Oxford English Dictionary, the Dictionary of American Regional English, A Dictionary of Americanisms, A Dictionary of Slang and Unconventional English, The Macmillan Dictionary of Historical Slang, or A Dictionary of American Slang.

"Jughead", however, shows up in the OED, DARE, and DAS with definitions such as "A mule or horse with a large, chunky head; by extension, a stupid or stubborn one" and "a person's head; a slow or stupid person." (Both of these are from DARE, but similar definitions appear in the others.)

The quotes date back to 1924 in DARE and to 1926 in the OED -- at least a decade and a half before the character's first appearance.

I don't know where you found mention of the supposed slang term "jaghead", but it doesn't appear to be documented in any of the standard reference works where one would expect to find it.

According to Memory Alpha:
http://memory-alpha.org/en/wiki/All_the_Infinite_Ways

This version of the pseudonym included Marie Severin. Any idea who else might have been involved?

Brian, it may be easier for you to limit your album covers by comic book artists to those albums that have actually sold more than, let's say, 1000 copies or something reasonable. (Maybe 10,000 or 100,000 copies, depending on your mood? Or maybe, let's say, hit the Billboard top 500 at any given point in history?) Half the albums mentioned so far probably don't have content that's listenable ...

Cub? Iced Earth? Cannibal Corpse? Jim's Big Ego? Yeah, they all hit that national spotlight..... *wheeze*

Really, a song about Barry Allen? And I thought Queen's "Flash" sucked royally.

Also Entertainment Weekly's EW.com had this story about Archie and revealed this little tibdit from an upcoming book by Bob Montana's widow Peg Bertholet:

Montana's widow is working on a book, The Golden Years of Newspaper Comics, that will clear up some mysteries about Riverdale, such as the meaning of the letter S on Jughead's shirt. The people at Archie headquarters in Mamaroneck, N.Y., aren't saying what that S stands for, but Bertholet will. ''Jughead's S refers to a place called Skunk Hill in Haverhill, which Bob turned into Squirrel Hill.'' Bob's elementary school near Haverhill called its athletic teams the Tigers. ''So,'' Bertholet concludes, ''Jughead's S meant 'Squirrel Hill Independent Tigers,' and you couldn't abbreviate it any other way.'' Jughead, the seer who never opens his eyes, voices his indifference to society in the silent, not-quite-scatological cryptogram on his shirt. He's a letterman in the sport of rebellion.

I would include Hewlett, although as co-member/creator of the band itself, he’s on a different level here.

True, but he also used to do Senseless Things covers.

I believe Shakey Kane has done some album covers too - I couldn't tell you what though.

And Dave Gibbons also did the cover to the one and only "The Madness" album. (The Madness were Madness with everything that made them great removed)

(in my opinion he did an even better job on Spawn than McFarlane ever did)

I wonder if the Gerry Rafferty John Byrne is the Scottish playwright (Tutti Frutti, The Slab Boys) and painter. Hang on . .. yup.

http://en.wikipedia.org/wiki/John_Byrne_(Scottish_artist)

Regarding made up comic credits, I know about David V Reed, but who was Nellie Rooke, who answered DC lettercol queries in the Seventies in such books as Wonder Woman?

I've seen Victor Gorelick stumped by what the "S" stands for, though, so I don't think there's really an answer.