Wizard's Grimoire Online
Thursday's new PDF is The Wizard's Grimoire, Revised Edition, one of the most popular supplements published for the 4th Edition of Ars Magica. (You can still download the 4th Edition core rules for free from e23, I should note.) You can still buy the WGRE in print from Warehouse23, but now you can also purchase it for download from e23 as well.