Tv Shows:
- Batman: TAS, GL, Young Justice, Superman, Justice League, Spectacular Spidey, Most of the stuff has something to like. DC animated movies line is also usually pretty good.
For comics, the way comics are written now, there pretty to jump into but some due to writers are easier than others. Pick up a trade you think looks good.
DC:
- New 52: Batman, Wonder Woman, Animal Man, Swamp Thing, Green Arrow, Batman/Superman and Superman: Unchained just started. The New 52 is mixed bag
Other good DC stories: DC: The New Frontier, 52, Batman: The Long Halloween, Batman: Earth One, Gotham Central, GL: Rebirth, All Star Superman, Superman: Secret Identity
Marvel
- Marvel Now: Most of the line, is pretty good. The Avengers titles seem to be little confusing but standouts would be Daredevil, Hawkeye, All New X-men, Superior Foes Of Spider-man, Thor: God Of Thunder , Indestructible Hulk, Avengers Arena, Young Avengers, Nova
Other good Marvel stories that new reader friendly: Brubaker's Captain America (2nd Cap movie will take some base from this), Spider-Man: Blue, Astonishing X-Men: By Whedon & Cassaday, Thor: The Mighty Avenger, Brian Bendis & Alex Maleev’s Daredevil, The start of New Avengers.
That's good starting point