Orbs have been known to show up at spiritual gatherings or around children when there is a lot of good energy.
Psychic people are prone to see and film them as Paola Harris believes..
David Icke's site has a couple of really good threads on this phenomenon and it's worth checking out.
Paola Harris feels that they are intelligent entities.
Her Video:
http://www.youtube.com/watch?v=ElVq6miCAws&feature=PlayList&
Here a young girl tries to explain to her dad how she sees rainbow spirits and the loving messages they deliver.
Video:
http://www.youtube.com/watch?v=jiIsU6no12s&
If the sighting or orbs that you see make you feel good and communicate messages of love, then they are from the good side.
Those who have always watched over us.
I think they are helping to raise our vibration before the coming changes.
It's all good.