I have downloaded the excellent Terrain Toolkit, iTween , the Detonator addon and other addons for unity. Usually these add an extra menu option in unity and extend the native editor.
What I want to know is whether I can make these addons load every time automatically in Unity - sort of like a permanent fix, without having to import them from their Unity packages for each project, every time I want to use them.
Is there some folder I can put them in so that they load automatically every time I start Unity?
Hey, I’m the author of iTween - if you figure this out let me know too 
You import them once, and then you export whatever you want from your project view as a package and name it whatever you want.
Then, you import just this new package you made anytime you make a new project and you will have the same folder structure and every prefab and anything else will keep working.
Also, you can put this extra package in your Unity-editor-standart packages folder if you want it to show up in the new project dialogs packages list.
Pixel you live in Bmore eh? I am right down the road… infact we are having a special olympics benefit at Angels Rock Bar tonight… just saying…