A while back, I remember seeing a service, and I believe more than one, that claimed that they would store letters of recommendation for you and send them on your behalf or the person writing the letter. That is, the letter writer would submit the letter to them, and then you could submit that same letter to different places requiring a similar letter through them, all without you ever seeing the letter. The idea is to avoid repeating work for the writer and avoiding constant asking for letters for the applicant.
The thing is, my Google-fu has completely failed me and I cannot find them again. Does anyone know what I'm talking about?