Yes

Kevin Roth's idea of using multiple -d options on the same command line was
just brilliant, and I could really think of a reason why we shouldn't support
it. The append function always append '&' and then the new -d chunk. This
enables constructs like the following:

 curl -d name=daniel -d age=unknown foobarsite.com

The attached patch brings this functionality. It'll be part of the upcoming
release.

-- 
  Daniel Stenberg -- curl project maintainer -- http://curl.haxx.se/