Mac OS X. Terminal curl

Today morning I found this blog post:
See Share Quotes In Terminal / Geek Tool

I'm from the Windows world and didn't know about curl in Terminal, so I tested:

Looks interesting? For me too. So I found how to work with the ftp via curl:
http://www.hyperorg.com/blogger/2008/01/01/beginner-to-beginner-ftp-via-curl/
One more nice example: how to detect my IP address with curl:
curl ifconfig.me