@Norman, and the various commenters, are correct in that it would be difficult to do this with bibtex and other tools. But, there is an alternative. Biblatex does allow this through the command \citetitle. Also, if you really want to, the formatting drivers in biblatex are easily readable and modifiable, but only if you feel the need. Unfortunately, it is not part of any distribution, yet, so it has to be downloaded and installed.