I'm looking for an online recipe box - something between dropbox and pinterest. Any suggestions?

Another vote for Evernote. Easy to use and navigate, versatile, portable (you can use across platforms), and very well-supported by the developers.

I like Ziplist a lot; it has both an iPhone app and a desktop recipe clipper. Plus, free.

If you're looking for something specialized for recipes, you might try
http://foodfolio.net or http://wegottaeat.com
(Caveat: I have not tested these sites, only found them through google)

Like Evernote, Google Docs can be great for things like this. It is easily searchable, you can add any links or pictures, and is accessible from anywhere the internet reaches.

I've started using Evernote for recipes as it works well for links to websites, articles I tear out of the newspaper, emails people send to me... it handles it all.

Sometime ago this question was asked on foodpickle and the responses were quite informative for me. Check it out:
http://www.food52.com/foodpickle/257-can-anyone-recommend-the-best-online-recipe-organizer-i-d-like-to-upload-recipes-i-ve-saved-in-word#pickle-answers

I've heard that Evernote works well for recipes.