there are more than one folders where blender stores addons. Before I found out about this I was also copy pasting after each svn build.
['F:\\BlenderSVN\\cmake-build\\bin\\Release\\2.69\\scripts\\addons', 'C:\\Documents and Settings\\batFINGER\\Application Data\\Blender Foundation\\Blender\\2.69\\scripts\\addons']
The first folder above is populated via make INSTALL. The second is where I keep my personal addons and is not touched by a build. You only need to copy the folder when the version changes, eg copy …/2.68/… to …/2.69/… Make sure you only have one version of an addon across all addon folders.