Underworld Lore combines the raw material and random tables that only the OSR / DIY community can into a great little package. He has done a great job of taking the material that he has gotten from fellow DMs and re-packaged it into a great 'zine.
Additionally Greg will be using Underworld Lore as a venue to debut those horribly, wonderful Petty Gods that he has been working on for the last year.
I look forward to seeing how this project develops as it moves from issue to issue. I expect it to only get better.