Short answer: Yes.

Throw me into a fresh install propagated with dummy data for a fake company. Make starting the demo a one click operation. When getting people to try things, you really need as few barriers to entry as possible.

What I'm suggesting comes from the same school of thought that motivates Wikipedia to allow edits without signing in, or StackOverflow to allow questions without an associated account.

See Twiddla's sandbox http://www.twiddla.com/ for an example of what I mean.