  XMM-Newton and Chandra have greatly deepened our knowledge of stellar coronae
giving access to a variety of new diagnostics such that nowadays a review of
stellar X-ray astronomy necessarily must focus on a few selected topics.
Attempting to provide a limited but representative overview of recent
discoveries I discuss three subjects: the solar-stellar connection, the nature
of coronae in limiting regimes of stellar dynamos, and "hot topics" on X-ray
emission from pre-main sequence stars.
