Alon lab, Weizmann Institute (transcription networks from bacteria to mammals)
Gunawardena lab, Harvard, (virtual cell program)
O'Shea lab, Harvard (systems and molecular analysis of signal transduction and transcriptional regulation)
Palsson lab, University of California, San Diego (metabolic systems biology)
Sauro lab, University of Washington (computational systems biology)

Interact with colleagues on ASCB's Systems Biology Community Forum.

BMC Systems Biology (journal on systems-level analysis of biological events at the level of molecules, cells or organisms).
Molecular Systems Biology (journal covering systems biology at the molecular level)

Intro to Systems Biology: Powerpoints from The Center for Biological Sequence Analysis at the Technical University of Denmark
Systems biology classes: Systems Biology Research Group, University of California, San Diego at UCSD.