Here is a quick background on my thoughts for Playground. Using libglade, I will load the file (with mf_loadui) playground.glade and expose certain objects to Foundation. When an extension loads it will be given a new "sandbox" to draw its interface in. This is the current thought at least. We shall see.
FOAF updates: Trust rankings are now exported, making the data available to other users and websites. An external FOAF URI has been added, allowing users to link to an additional FOAF file.
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If you're a C programmer with some spare time, take a look at the mod_virgule project page and help us with one of the tasks on the ToDo list!