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Or you may just use readtags.(h|c) from the Exuberant ctags sources =)
Also, there is a nice Python library for ctags files python-ctags. Combined with show_overlay it might have been an awesome feature.
Oops, I just didn't get it. ["ctrl+k", "ctrl+b"] means Ctrl + k + b, not Ctrl + k or Ctrl + b.

Don't know how to remove this echo =(