Yup, lot\'s of things.
You have 3 options.
1. Install the qtopia screan rotation app. Requires that you restart qtopia for changes to take effect, but that\'s only about 15 seconds.
2. Install some ROM using OPIE instead of qtopia, OpenZaurus is the best, but there are others, and i\'m not sure about the working status of OZ on the 5600, there\'ve been mixed reports. 2 advantages here, opie kicks ass, and the screan rotation will work on the fly.
3. Becaome a Zaurus hack master and manualy install qtopia 1.6.2 or 1.7.0 to your 5600 which has the same \'on the fly\' rotation os opie, bad news is that this is difficult to do end even harder to do well.