An excellent and largely system-free setting that can easily serve as the jumping off point for a campaign in any system (though the tiny bit of system information included is geared toward D&D). It's also 100% OGC - all of the text, the maps - everything. This means that if you want to alter the document and host it on the web for your friends to download, you can legally do so. This makes it an even more attractive option for a campaign starter, in my opinion, as it makes getting all of your players 'into' the setting much easier and it encourages you to customize it to your taste (frex, I personally re-wrote large swaths of Blackmarsh to better reflect the implied setting of my own favored rule set). Overall, an excellent product!
[4 of 5 Stars!]