But DC retaliated, and tried to do one or two books that were relevant, as well as a couple that just seemed to tread into that Marvel style. So what titles, or spans of a title, did DC have that were Marvelesque?

Three immediately came to my mind...

The original Metamorpho stories by Bob Haney and Ramona Fradon seemed to really get that feeling.

The Doom Patrol by Drake and Premiani also had a Marvel like feel to 'em.

And of course, Kirby's Fourth World (even including Jimmy Olsen) could have been under Marvel's banner. But then, Kirby.

I'm interested what YOU think. And also - although I don't suspect it was intentional nor particularly desirable - do you think of any Marvel characters or runs as being very DC-like? I figured that maybe Marvel Team-Up and Marvel Two-On-One* were a little similar when they were just doing single issue stories. And while I only read it once, the Sentry seemed to be a direct DC... er, homage, and a tiny bit in the DC form.

So what unintentional crossovers do you think have been published?

EDIT: As I consider it, maybe the original Marvel Nova character had a little DC in him, as well as Marvel's attempt to recreate Spider-Man.

*Yes, I know. It's an inside joke known only a few thousand readers. Don't start with me. ;)

If any others come to mind, I'll post my thoughts. 

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Fascinating (as Spock would say). I have read Flash tales from that era, via reprints, and would not have thought of them as being akin to Marvel.

I've been looking at DC Comics' STAR TREK and STAR TREK: TNG books over the weekend, refreshing my memory. They do feel "Marvel-like". And, odd though it may sound, Marvel UK actually reprinted the late 80s TNG comic that DC produced.