I'm well overdue with my next Tharsis update, which I've been planning to write since 3 months ago or so. For now, here are two presentations I gave on Tharsis recently. The first presentation explains the rationale for component-based entities, while the second concentrates on Tharsis itself and its potential performance limitations.
Meanwhile, work on Tharsis is moving (slowly... but still moving). Currently I'm working on an example Process and Component that would handle entity spawning while allowing to modify the entity being spawned (e.g. by overriding its components). Processes and Components such as these will be packaged with Tharsis as an optional library to cover most common use-cases for beginners while advanced users will be able to write their own.