[Crinus]

One interesting piece of advice i heard some time ago is that you shouldn't worry about what your competitors are doing or might do since you have no control over them nor over how your customers perceive them, so any time spent dealing with competition is time wasted not working on your own product.

(note that this was in the context of smaller developers / indies / MicroISVs / etc, it might make sense to do the above if you are a big company with a dedicated marketing department)