From Millepah Software:
ErgoNotes is a note keeping software enabling you to keep all your PPC NOTES in one place using a hierarchical structure. It keeps all the data in XML-based file that you can easily access your information by means of other applications. You can run ErgoNotes in your Pocket PC and Desktop PC as well. It features modern interface which does not require a great deal of re-learning, as it is similar to the program provided by your pocket PC, search feature allows to find several nodes at once, clipboard support enables you to exchange data not only within the program but also between desktop Ergonotes and other applications, collaboration with pocket PC, and drag-n-drop features.