This package includes an introduction to the Dungeon Crawl Classics RPG, a 0-1 level adventure "The Portal Under the Stars", a 5th level adventure "The Infernal Crucible of Sezrekan the Mad", and gorgeous art. A print version was available free on FreeRPG day 2011. I picked up a copy then, but I found myself wanting to run the first adventure when I didn't have access to my print version so I purchased the PDF version.
I ran this as a quick game over the holidays for family members. There's no quick-play rules (you need the free Beta rules download for that), but they're barely required due to the nature of the adventure. If you've played a d20 game before, you'll pick this up with no effort.
(I used an online 0th level character generator to speed things up, creating multiple set of characters and let my players pick one set each. Google "DCC RPG resources". The rules for creating characters by hand are in the free Beta rule download, and are very fast.)
"Portal Under the Stars" is primarily exploration of an ancient crypt, with some combat and traps. There's enough information for the players to learn the history of the crypt, and there's a final "boss fight" which can be avoided by clever/lucky/unlucky/greedy characters. There are nine rooms outlined, including the "foyer" and treasure room, but there's plenty to think about and do in all of the rooms.
[5 of 5 Stars!]