General:
* Everywhere
* Scattered
* Dispersed
* Diffuse
* Widespread
* Unorganized
* Haphazard
* In disarray
* In a mess
More specific:
* For physical objects: strewn, strewn about, scattered around
* For information or ideas: jumbled, muddled, confused, chaotic
* For emotions: overwhelmed, frantic, agitated
Informal:
* All over the map
* All over the shop
* All over the show
The best synonym to use will depend on the specific situation and the tone you want to convey.