I tried different web based applications and I was never satisfied with either the formatting of the ingredients (some are too loose - and you will not achieve good computability and some are too strict and will demotivate you pretty quickly);
For a while I sticked to using paper but sharing the recipes on my blog or with friends resulted in duplicated work.
Using a general tool, like Evernote, left me unsatisfied because there isn't a specific structure that facilitates your task and there is no interaction with other users.
So, since I am a seasoned developer and I also really love cooking (/my blog italianMondays.com) I decided to create a the web app I wanted: without unnecessary cluttering, graphically pleasing, free and fast, open (as in the data always belongs to the user) and easy to use also on mobile (not really there - yet).
I added the simple functionalities that I wanted and now I am engaging the users to drive the development of the new features and it's working well. Some asked for localization (and it's now available in en/it/pt), others wanted a sharing functionality for social networks, other wanted the generation of shopping lists, import of recipes from blogs/websites, conversion between metric and imperial units, export for publishing and printing... It's becoming a full time gig! :)
It can be seen at beta.cook-q.com and suggestions / requests are welcome!