Abbreviations

[Karina Aleksandrova]

Hi, I'm kind of new here; well, I joined HPfGU group a while ago, but
I wasn't active much, and now I wanted to read some posts there, and
I'm utterly confused by all the abbreviations... DDM -- I suppose must
stand for "Dumbledore's Man", but what about ESE, OFH and LID? 

I didn't want to post to the list with such a newbie question, but I
thought maybe someone can help me out here?