Hello. There is currently an effort to reorganize the Playground wiki area. The plan is to create a hierarchy that makes clear where to look for and where to add content-- as the adage goes, a place for everything, and everything in its place. After some feedback from the dev mailing list, here is a page with the overall game plan.
The main headings on this page (currently mostly links to empty pages) will become top level pages. This small set of main pages will contain the sub sections and subsequent links. These main pages could get a little large, but the sub sections can always get broken into separate pages if needed. You may see some of these changes starting to make it into the existing playground already.
If you have a minute to check over this organization scheme, your comments would be appreciated. Do you see any missing sections? Would you be able to find what you are looking for easily? Is there any ambiguity, or two locations that are too similar? Can you think of any notes that could be added to make those main areas more clear?
Over the next few weeks, I will be filing existing pages into this new structure. If you are interested in offering a few minutes to do a little of this grunt work, please let me know! Hopefully, these changes will help the playground continue to be a great resource as it grows with Arduino's popularity.