First and foremost - you shouldn't mistake this show with
Ghost Hound witch aired a bit later.
Ghost Hunt is a roughly 2 year old series produced by J.C.STAFF and if I were asked to summarize it with one sentence it would be - 'surprisingly good'.
The basic concept of the series is about young, carefree and energetic girl by the name of Mai who gets mixed up into working with a fairly unique team of exorcists. The show consists of several, 3-4 episode long arcs in witch our daring yet eccentric group of ghost busters solve different paranormal riddles.
The mood is mostly energetic and not all to heavy though it's more thanks to the hilarious and easily likable cast than the setting. The show itself may still scare you a bit on several occasions.
As I said before although I stumbled on it quite randomly, I found the series surprisingly good. The main reason for my enjoyment is probably the excellent mix of comedy, horror, adventure and mystery (and some hints of romantic interest from time to time) we are presented with, combined with more than solid production quality.
It all just fits together so nicely. :)
Those who liked xxxHolic, Jigoku Shoujo or Rental Magica should find this more than interesting.
Some screenshots witch will serve as a cast presentation :
Mai - the main heroine
Shibuya "Naru" Kazuya - group leader and founder (a male tsundere BTW)
Others...
The whole team
(*fixed - thx hermit)
Last I checked the series could be watched here -
http://www.animesquish.com/2008/04/ghost-hunt-episode-list.html
- though I believe it should be experienced in far better quality.