Blender's geometry nodes is now getting updated with new nodes so often that it's hard for me to choose one to feature, but this one is a no-brainer: The new "Distribute Points in Volume" node by Iyad Ahmed.
New geometry nodes node "distribute points in volume"
Nuevo nodo para geonodes, para distribuir puntos en volúmenes.
— Nahuel Belich (@Nahuel_Belich) September 19, 2022
This self-explanatory addition to GeoNodes' ever-expanding roster allows for a behavior that could only be faked before: Filling a volume with points, which can then be used to instance objects. This is particularly useful with objects that have a transmissive shell, inside which are multiple tiny objects, a case that can't be faked by simply scattering on or near the surface. The video below shows a couple of examples of cases I think such a node would be useful, these were very easy to set up thanks to Iyad's contribution!
This node is available in the latest Blender 3.4 daily builds, download it on the link below to try it out right away!