Re: SIunit

Come da manuale di SIunit, puoi aggiungere delle unità personalizzate:
`\addunit{\foot}{ft}`

Ti segnalo il recentissimo pacchetto SIunitx,
http://tug.ctan.org/cgi-bin/ctanPackageInformation.py?id=siunitx
la cui descrizione recita:

The siunitx package takes the best from the existing packages, and adds new features and a consistent interface.
A number of new ideas have been incorporated, to fill gaps in the existing provision. The package also provides backward-compatibility
with SIunits, sistyle, unitsdef and units. The aim is to have one package to handle all of the possible unit-related needs of LaTeX users.

Ciao,
Agostino