Great news that yet another digital asset for scholars is on the way. Hamlet online is about to go live with a previously impossible features for the scholar. The Arden Shakespeare finally has a rival - the individual reader - who may consider the many varying editions of the text side by side and make their own edition...
An important feature of the resource is that it is to be available free, this was a condition of finance by the funding bodies, including the NEH the National Endowment for the Humanities in the US.
There is an article online here.
The site itself is in the .org domain at Quartos.org and yes it IS all about the TEI and the XML!