Several people have written in to tell me that rjags crashes if you re-run a modelling script in the same R session. The crash is caused by a memory management bug in the JAGS library that is triggered when you overwrite a jags model object with a second call to the jags.model() function.
JAGS-1.0.1 fixes this problem. Since the rjags version is tightly linked to the JAGS release number, you will also need to install rjags-1.0.1, even though this has no code changes compared with rjags-1.0.0.
People using only the command line interface can carry on using JAGS 1.0.0.