[GRASSLIST:1716] not grass specfic; USA locations only; conversion of township range section FEL FNL to utm (or ll)?

hi-

does anyone know of piublic program or urls to convert from the USA PLSS (township range section (fractional sections) feet from eastline (fel)
and feet from north line (FNL)) to utm or whatever?

so far I've found:

at http://www.cnde.iastate.edu/staff/swormley/maps/utm.html trs2ll seems to do what I want but is may be not very accurate (its based on 100K dlgs)

at http://lm0500.blm.gov/ one can find al lot of raw data.

thanx

Robert L Sandefur
Principal Geostatistician
Pincock Allen & Holt (A Hart Crowser Company)
International Minerals Consultants
274 Union Suite 200
Lakewood CO 80228
USA
303 914-4467 v
303 987-8907 f