Mari and I went to see Ghost Town yesterday, on the recommenation of D&J (I think).
We liked it. The plot = Ghost + Sixth Sense + Ghost Dad + (insert ghost movie here). The characters were enjoyable, especially Dr. Pincus-played by Ricky Gervais. He's a snarky dentist who finds out he can talk to dead people. One thing leads to another and... the end.
The script is very well-written and very funny. They drop two F-bombs, which are probably why the movie is PG-13. The movie is generally funny, but also has sappy sweet moments that are not overdone.
It's not in theatres everywhere anymore, so if it isn't in theatres near you, pick it up when it comes out on DVD. You'll have fun.