I found this interesting and read this awhile back.
Superman-ly Superheroes: Marvel's MEN OF STEAL
Super-Marvels
Superman, 75 years after his inception is still one the most recognizable characters and brands on Earth. The anniversary video made for the character shows just how much he's captured generations of fans, through many incarnations.
But DC doesn't necessarily have a monopoly on Men of Steel. The Marvel Universe has been populated with many similar characters over the years, some obvious analogues, and others that are more spiritual successors. One Superman-inspired hero, the Blue Marvel, has just resurfaced in the pages of Mighty Avengers, a team he'll be joining fully in the coming months. Another, Hyperion, is already a member of the main Avengers team, and yet another, Sentry, has returned from the dead to plague the Uncanny Avengers.
Meanwhile, Marvelman/Miracleman, a "second generation" Superman-inspired character (directly inspired by Captain Marvel/Shazam, who was inspired by Superman), makes his return in reprints of a thirty year old story that's been nearly impossible to find, by no less of writers than Alan Moore and Neil Gaiman, in January.
SPIDER-MAN
There's been a surprising amount of discussion online over whether or not Marvel's Friendly Neighborhood Wall-Crawler is a Superman analogue or not. On the face of it, it doesn't seem to be the case when you consider power-sets or the character's backstory, but when you look at it from another angle...
Works for a newspaper in a major Metropolitan area? Check (Well, most of the time). A secret identity that enjoys a flipped social status from the superheroic identity? Check (Again, most of the time). Survivor guilt? Check. Constant need to do the right thing at all times, underscored by the few times when he's ignored that need and come to grief as a result? Check. Red-and-blue costume? Check. Longstanding marriage that was undone due to corporate desire to de-age the character? Check! It's like they're the same guy, you guys. If you, you know, squint hard enough and really want that to be the case.
CAPTAIN MARVEL
A strange visitor from another planet who came to love humanity so much that he fought on its behalf — even, eventually, against others of his own race.
Sound familiar? Sure, Mar-Vell — his name even sounds like Superman's Kryptonian name! — may have messed up the whole "secret identity" thing (you're supposed to pretend to be an average joe, not swap places in space with an average joe who gets dumped in the Negative Zone when you're off saving the day), but Marvel's mishmash superhero certainly has some DNA in common with the Man of Steel.