Airborne ISR – What are the various current and forthcoming types of Airborne ISR sensors ?

As of now it seems the types of Airborne ISR sensors that are in use are:

1. Electro-optical imagers (EO/IR),
2. Radar (including ultrawideband, UWB), Laser radar,
3. Seismic/Acoustic monitoring,
4. Ad hoc wireless sensor nodes (WSN)

Are there any other Airborne ISR sensors that are in use ? Also, are there any new types of Airborne ISR sensors that will become available in the next few years ?