I have troubles to convert Affy ids to some other standard symbols for further processing:
The data I'm working with is the leukemia data set (Golub et al., 1999).
I use the golubEsets data set retrieved from Bioconductor project.
I tried this tutorial (http://faculty.washington.edu/kenrice/sisg/sisg-sea09-09.pdf)
# library for annotation
#library for golub data set
geneids <- featureNames(Golub_Merge)
# retrieve something usefull (e.g. gene name)
The Golub dataset isn't produced from a hgu95av2 affymetrix chip. It used the older hu6800.
Just typing Golub_Merge at the R command line will give you the summary information and list the Annotation field as "Annotation: hu6800"
See http://bioconductor.org/packages/2.6/data/annotation/html/hu6800.db.html for the correct annotation library.