It is a sad user experience (and a standard test of mine):

• Download hudson (version 1.102)
• Startup the server (i used the contained engine)
• You are prompted to enter a new job
• name it "my test" and click "create"
• Receive the following:

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Status Code: 404
Exception:
Stacktrace:

(none)

Generated by Winstone Servlet Engine v0.9.6 at Thu Apr 19 09:47:30 CEST 2007
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The URL reads as follows:
http://localhost:8080/job/some%20test/configure

And it surely has to do with the space/%20 and is related to the issues #186

Keep up the great work, hudson rocks.