Mychem 0.8.1 has been released on 2010-09-07.
This version fix an important bug. All functions using serialized obmol type were impacted. The problem has been resolved by using the solution published by the pgchem project.
Mychem is now fully usable with MySQL 5.0 and 5.1. It should also be working with MySQL 4.1, but it has not been tested.
The bug list is now empty. I'm waiting for new providers!