Is HTTP/1.0 still in use?

Question

Say one is to write an HTTP server/client, how important is it to support HTTP/1.0? Is it still used anywhere nowdays?

Edit: I\'m less concerned wit

Answer 1

I use it all the time when I'm telnet-ing to a server to verify connectivity or figure out why it's not working:

$ telnet 192.168.1.1 80
GET / HTTP/1.0\r\n
\r\n

... 

(Because making a 1.0 request doesn't require that I provide any extra headers).