If you have a comixology account(And if you don't, it's simple and free to sign up) then until Tuesday at 11 P.M eastern you can head right over here to get 700, count em, 700 free digital issue #1's.(Interspersed with tons of one shots, annuals and other great stand alone content)
Honestly, if you're a fan of comic books, want to get into comic books after seeing the Marvel Movies or are a lapsed reader interested in checking out some of the fresh new series in Marvel NOW! Then this is EXACTLY the opportunity you need. Everything is here, from some great new stuff like Superior Spider-Man, All New X-Men and Young Avengers to classics and even TONS of content from my favorite comic universe(The Ultimate U) With some great tastes of excellent books like Ultimate Spider-Man and The Ultimate's.(And Also an issue of Ultimatum, the worst comic ever written)
Best part? All free, as long as you get them into your comixology collection before the deal expires all 700 of these beauty's are yours no strings attached(Except the desire to buy more when you find a series you like of course). They were having some pretty nasty server trouble but as of writing this it seems to be mostly resolved.
Update: The event has been Put on hold due to the overwhelming demand, I'll update this topic again with further info when it becomes available.
Update 2: It's actually back, finally but you need to use that link and sign up for it by 9PM Tuesday, so if you want to receive this hurry and sign up now.