What is this Zapier really? What are some examples of what it can do?
These services that basically sound something like "With our tools, you can do anything with data!!" always confuse me.
Until otherwise convinced, I'm of the opinion that if you can do "everything", you do nothing.
They've defined a bunch of methods for popular APIs. You can then pipe the results into another API.
e.g. Watch Disqus comments and auto send thank you mail
Send email attachments to your Dropbox
Create Trello cards from Evernote items
Checkout the Directory, then click on an item - you'll see all the possible interactions:
Oh wow, that's what I needed to see. Impressive. Almost overwhelming! Thanks