Colin Rourke, of Mathematical Sciences Publishers, has provided a new package. the catalogue entry says:
Pinlabel is a labelling package for attaching perfectly formatted TeX labels to figures and diagrams in both eps and pdf formats. It is suitable both for labelling a new diagram and for relabelling an existing diagram.
and the package may be found on CTAN in directory macros/latex/contrib/pinlabel
users may browse the new package's directory, and read its documentation, via the catalogue entry
http://www.tex.ac.uk/tex-archive/help/Catalogue/entries/pinlabel.html
thanks to colin and msp for the upload --
Robin Fairbairns
For the CTAN team