I have written 2 sourcebooks for d20 Modern which will be out soon (April to May) in PDF form, and shortly following in print.
One is called Blood and Relics, and is a mystical occult conspiracy campaign model.
The other is called Blood and Fists, and is a martial arts supplement, and will include adventure material in the form of a full-contact tournament with rules and NPCs.
Follwing the release of Blood and Relics, we'll be doing at least one, quite possibly two adventures for the setting.
In answer to Bagpuss' concerns about market dilution, let me say I've given this some thought, and I don't think it's a big problem.
For instance- the adventures I am writing for Blood and Relics will be VERY playable by any Shadow Chasers campaign model, as well as being adaptable to any Modern model where magic and monsters are in play.
Blood and Fists and its tournament work very well in special ops and espionage type games (there's a hook to the tournament where a spy with extensive martial arts training is asked to join the tournament to find out who the Yakuza in charge are).
So- my feeling is- adventures will be more adaptable than people think.
Just one designer's two cents
