I don't. There are programs that purport to develop perfect pitch, but I don't see that there's much to gain. There are so many professional musicians who don't have perfect pitch, and some musicians who do have perfect pitch have expressed how that ability sometimes gets in the way of performance when slight changes in key are made. Also, having perfect pitch does not guarantee that one will be a good musician.
If I believed that perfect pitch would help improve my musicianship in a way to make appreciable gains, I'd probably look into one of the programs available to help develop it or, at least, to make some improvements.
Also, if I believed it could generally improve musicianship, I would use such a program in music lessons at my school. The most I've read about gains made has been in the advertising literature for such programs.
It is more important to develop knowledge of relative pitch, and everybody is capable of developing those skills.
