Here’s another one of those, “Why didn’t I think of this before?”
You can easily fix a wobbling table with sliced wine corks, which are perfect since they can really grab some friction while re-using them will be environmentally friendly too.
Tired of spilling coffee on your homework papers or laptop keyboard? Don’t waste perfectly good napkins to stop the wobble. Stick a few of these cork discs in your backpack or pocket and use them to steady that shaky table.

Other interesting stuff at Zedomax.com: backpack, coffee, cork, friction, homework papers, laptop keyboard, napkins, wine-corks, wobble
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