n December 2010, the XXL survey, an XMM-Newton Very Large Programme, has been granted time to map two extragalactic regions of 25 deg2, at a depth of ~5×10-15 erg/cm2/s (using 10 ks observations). While the main goal of the project is to constrain the Dark Energy equation of state using clusters of galaxies (cf. http://arxiv.org/abs/1009.3182), it will also have lasting legacy value for cluster scaling laws and studies of AGNs and XRB.
The project is open to any scientist belonging to the international astronomical community, and interested in actively contributing to the general legacy effort.

A kick-off meeting is organised by the XMM-LSS collaboration in Bonifacio (Corsica, France) from the 2nd to the 6th of May 2011.

Workshop topics include:

X-ray observations and processing
Follow-up observations
Multi-wavelength catalogues
Science (clusters, AGN, galaxies, XRB, theory, etc.)