Google has changed the way they display reviews from outside sources. They've also changed the review count to reflect the number of reviews provided by google account holders only.
This means that if your business had a lot of outside reviews (from, say, Yelp), Places now does not count them.
They're still citations, however.
I understand this post may seem a little cryptic and incomplete — here's the full story about the Google Places change. If you want more in-depth info about how Google Places works and what it is, leave a comment!
(Sidenote: The changes may be the result of current anti-trust litigation that Google is in.)