If you use the Minecart with Command Block and an Activator Rail to activate it, the command written into the command block gets activated several times. I hope the screenshots will explain it a bit better than my fairly bad english.
Just a little explanation oof the screenshots:
First one shows the setup, the other two shows the output after the Minecart went over it one time.
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I doubt it's intended, as it prevents you from activating the command block once, even if it glides over a single rail as fast as it can. There are already clocks this fast via ordinary command blocks - this bug doesn't give you any better clocks.
A command block minecart would already be very useful simply because it can move around and thus make excellent use of relative coordinates. There's no logical reason to forcibly integrate a fast clock into it - you could have already created a fast clock without it, and forcing it to use one interferes with the many uses that don't require fast clocks.
I'd love for Mojang to chime in here.
Correct me if I'm wrong, but isn't that five times per second? I'm not a Redstoner at all, but it seems for me that it's still too much...
You can easily toggle an activator rail on & off multiple times during that delay to limit it to running once, especially if you combined it with a detector rail to disable it immediately.
After watching the Sethbling Video (http://www.youtube.com/watch?v=YfVRNPg2ZiA), this might be intended.