In Application Manager drop down select Tools-> Application catalog...-> New button. In the Catalog details window enter the following fields:

Catalog name: Chinook Extras
Web address: http:repository.maemo.org/extras/
Distribution: chinook
Components: free non-free

This will give you a lot of applications you can install. All the Chinook applications I've installed in Diablo have worked. They are both OS 2008,