Nutch 2.0 has a few issues. Do not run it in production unless you are very aware of it's problems. Nutch 1.4-dev will run even in production happily. I use the latest revision in a large production environment but 1.3 in a series of smaller production environments.
> How usable are the development versions? like 1.4 or 2.0 - for example > could I use 1.4 for non-production use without problems? > > Best Regards, > C.B.

