The new version of DB2 Express-C, version 10, is out, and it's more flexible and powerful than ever before! Starting from the fact that it now allows you to use 4GB of RAM instead of 2GB, this will boost different database operations. The database size is still unlimited (compared to 11GB for Oracle XE, or 10GB for SQL Server Express). Speaking of Oracle, DB2 Express-C includes the "Oracle compatibility feature", which means that as much as 98% of code written for Oracle could run with no changes on DB2 Express-C!.
There are other cool new features in DB2 Express-C that you can use and configure with minimal effort. For example, "Time Travel Query" allows you to develop "time-aware" applications with minimal effort. This is helpful for audit purposes, governance, and to solve problems because this feature will let you query your data as it was in a given period of time that you specify. This can help you to easily and quickly create charts like the ones you see for stock prices, for example.
Check out the article "DB2 Express-C 10: Even more value" for more details, and download and try DB2 Express-C 10! It's free!