Debra Jensen and I have worked together on the compilation of an international bibliography of critical works on Simone Weil. Currently over 5,000 titles are listed online as Simone Weil Bibliography (https://simoneweil.library.ucalgary.ca/) . With Debra's untimely death in July 2012, the English language material will no longer be annotated, but I will continue to post updates to the bibliography and to this blog.
The Gateway Bayerin provides great access to German (and French) essays and books on Weil. Particularly useful for highlighting articles published in edited works.