New Sourcebook-Ideas?

So I am working on a new source book/osr companion. It's going to have a lot of the classes I sold via DYS Games, and a bunch of new ones (and a new race or three). It will also have things like a fantasy version of my skills and talent rules from Tools of the Worldshapers.

What other things would people find useful/interesting? 

Thanks to Alex's suggestions, there will probably be some new Dwarf Machinist creations statted up and usual new spells and items as well. 

This will be a primarily 'player facing' book, meaning its lots of options for characters to use primarily, rather than, say, adventures or other DM utilities. 

 

As a Referee, the three things I find myself in need of are:

1. Adventures, even small ones.

2. NPCs of all sorts, as well as NPC-related locations (inns etc.).

3. Random tables for generating all sort of content on the fly.

*Edit* Whoops, posted in the wrong thread.

[quote="golan2072"]

As a Referee, the three things I find myself in need of are:

1. Adventures, even small ones.

2. NPCs of all sorts, as well as NPC-related locations (inns etc.).

3. Random tables for generating all sort of content on the fly.

[/quote]

[quote="Tywyll"]

This will be a primarily 'player facing' book, meaning its lots of options for characters to use primarily, rather than, say, adventures or other DM utilities. 

[/quote]

Don't feel too bad, though, Golan.  I'm pretty sure I asked Tywyll for the same thing on G+

 

I would find machinist's automatons useful.  Potentially spells as well, though I'm deliberately trying to keep some of the limitations inherent in the original short lists (no even-numbered damage spells and I don't use the book Summon X spells).

Unfortunately I'm not your target audience otherwise; I'm already using the PC for it's build systems but not all the pre-built classes, and more player-facing options is not what I want for world- or setting-building.