How can I stop chocolate chips sinking to the bottom when I make cakes? I love making and eating chocolate chip cakes - both large cakes and cupcakes, but almost always when I make them, the chocolate chips sink to the bottom (or, occasionally, rise to the top).

Is there anything I can do to try and stop this happening? If so, what?
Coat the chocolate chips in flour (whichever type of flour goes into your cake).  Put a few ounces or two of flour and the chocolate chips into a zip-top bag, close tightly and shake.  The coated chips will then adhere and tend to "float" in the batter.  Subtract the amount flour used to coat the chips from the flour otherwise used in the recipe.  

You could do this with cocoa powder instead of flour.