Have spent the last week or two starting to get to grips with Android development (with a view to developing an augmented-reality app for walkers building upon the OpenTrailView idea, but more of that later) and have developed a simple first app. Walknotes, available here is a simple app which allows you to annotate paths in-the-field, for example report problems with paths or make comments on an interesting view or site of historical interest. These notes will be uploaded to the Freemap server and displayed on Freemap itself.
Note that this is my first attempt at Android development: it seems to work on my phone (Hero running 2.1) but obviously I have not tested it on a wide range of devices. So if you’re interested in annotating Freemap in the field, do give it a go and do let me know if there are any bugs or crashes. It requires Android 2.1+.