I have added a small patch that asks for confirmation before doing the actual darcs send. This has saved me from making an idiot out of myself in public a couple times already. The patch is called:
Sat Nov 15 09:59:33 CET 2008 Christian Kellermann <Christian.Kellermann@nefkom.net> * resolve issue1186: ask before sending a bundle
This is not in the darcs repo because the devs could not reach consensus whether this confirmation question should be part of darcs. You can follow the discussion in this thread.
I have added a local copy of the darcs repo which will contain all my patches. Feel free to comment!