Comment Spam

COMMENT SPAM….Comment spam is once again becoming a problem here, and I notice that several other bloggers are complaining about it too. So I have a question I’d like to throw out to the crowd.

Is there any way (via plug-in, maybe) to require commenters to preview first before posting? As long as the only way to preview is by clicking a mouse button (i.e., no programmatic workarounds are available), this would prevent all robotic spam. What’s more, it would even have the beneficial side effect of forcing people to read their comments before posting them.

Is there a way to do this with Movable Type?