Serious health games are gaining interest among the medical and scientific communities.
In order to estimate this interest, I have checked in the American National Library of Medicine bibliographic database MEDLINE using the Pubmed Service search engine (world largest bibliographic life sciences and medical database).

Methodology
The search “Health game computer or video” yielded 44,089 entries as on August 28th 2009. However, using the boolean syntax and the field limits, the search ((”health”[MeSH Terms] OR “health”[All Fields]) AND game[All Fields]) AND ((”computers”[MeSH Terms] OR “computers”[All Fields] OR “computer”[All Fields]) OR video[All Fields]) generated 249 entries among which 16 review articles.

Interestingly, Pubmed can generate the RSS feed of this search (with a limit of maximum 100 articles)
I also searched the terms “Serious game” which yielded 116 entries.

Results
Based on their title or abstract when available, a substantial amount of articles in this last result were dedicated to the impact of gaming on social or physiological parameters.
An empirical selection was carried on non equivocal title or abstracts of articles dealing with a specific program dedicated to health profesionals or students and to general public or patients. The selected references were copied to the clipboard generated 31 entries published between 1977 and 2009, which could be sorted as :

a) Students Training or Continuous Medical Education Games : 10 articles
b) Patients awareness and Therapeutic games :14 articles
c) Children or General public awarenes games : 07 articles

For group b) and c) the major themes associated to health games were :
Asthma : 5 articles
Psychological disorders : 4 articles
Sexual Risk Prevention : 3 articles
Cancer : 2 articles
Nutrition / Diabetes : 2 articles
Other themes (5 articles)

Most of the games were developed in house and few of them studied were commercialized.
However, some of them are available on-line :
- Treasure Hunt : Serious game for psychotherapeutic treatment of children
- Re-Mission : involve young patient with cancer in their treatments
- Dominic Interactive : Children awareness on their own potential
- Heart-Sense : Program for recognition of heart attach symptoms

Conclusion
This overlook study has revealed that health games are used for different purposes and some of them have proven efficacy as a complementary solution for patient treatment or as useful tool for public awareness on health related subjects.
As it is a new field, a few review articles are already available for further comprehension and analysis.

Source : Pubmed : http://www.ncbi.nlm.nih.gov/pubmed/ (visited on August 28th 2009)