R help - Apr 2012 - Multiple equation models in time-series cross-section (panel) data

Hello,

Could anyone recommend a package for multiple (i.e., structurally
linked) equation models for time-series cross-section data?  I've been
using the "plm" package for single-equation, fixed effects models, but
have not been able to find a package with similar functionality for
models with multiple correlated outcomes.

Many thanks,

David