We develop PowerPress with the following WordPress versions:
- Latest version (e.g. 2.9.x)
- Previous major version (e.g. 2.8.x)
- Development version (e.g. 3.0 RC2)
With the release of WordPress 3.0, future WordPress versions will be developed for 3.0.x, 2.9.x and with the development version of 3.1 when it is available.