[RyanZAG]

Github for food (recipes) seems like it would work pretty well, really.

https://www.google.com/search?q=github+for+recipes

The rest seem less useful...

Dropbox for cars makes no sense. Do you mean a garage?

Twitter for fashion - already exists! Just follow people who talk about fashion on twitter already.

[hkmurakami]

Wasn't there a HN'er who ran a site called "Fork the Cookbook"? I seem to remember him posting in the Google Reader thread recently.

edit: here it is! http://forkthecookbook.com/