I wonder if an annotation package used by oneChannelGUI could be useful 
to you.
The packages:

HuExExonProbesetLocation,MoExExonProbesetLocation andRaExExonProbesetLocation are derived
by Affymetrix data annotation and contains the following info:

library(HuExExonProbesetLocation)
as.data.frame(HuExExonProbesetLocation[1:3,])
EPROBESETID  CHR STRAND START  STOP GPROBESETID ANNLEVEL

2315101 chr1      + 11925 12167     2315100 extended
2315102 chr1      + 12657 12692     2315100 extended
2315104 chr1      + 13366 13888     2315100 extended
...

  Gene level annotation can be generated using the stand alone function 
standAloneBuildingLocalAnnotation present in oneChannelGUI package.
This annotation provides the following info:
"PROBESETID","ACC","SYMBOL","DESCRIPTION","CYTOBAND"

Annotation can also be added to a data frame using the stand alone function:
standAloneAddingAnnotation

library(oneChannelGUI)
?standAloneBuildingLocalAnnotation
standAloneBuildingLocalAnnotationpackage:oneChannelGUI R Documentation

Creates a data frame with gene-level annotation data for exon arrays
using the netaffx database

Description:

      Standalone oneChannelGUI function to create gene-level annotation
      data using netaffx database.

Usage:

         standAloneBuildingLocalAnnotation(libDirLocation = getwd(), 
netaffxUser = "myemail@somewhere.org", netaffxUserPw = "yourpassword", 
whichAnnotation = c("HuEx", "MoEx", "RaEx"))

Arguments:

libDirLocation: Folder where to save the annotation object

netaffxUser: The email registered to Affymetrix netaffx web site

netaffxUserPw: The password to access to netaffx

whichAnnotation: Which annotation table should be used

Value:

      Location of the annotation data frame.


?standAloneAddingAnnotation
standAloneAddingAnnotation    package:oneChannelGUI    R Documentation

Attach to a data frame containing gene-level data derived from
Affymetrix exon arrays the annotations derived by netaffx

Description:

      Standalone oneChannelGUI function attaches gene-level annotation
      to a data frame.

Usage:

         standAloneAddingAnnotation(annotationdf, df.tobe.annotated, 
ids.column)

Arguments:

annotationdf: An annotation data frame generated with
           standAloneBuildingLocalAnnotation function

df.tobe.annotated: A data frame containing a gene-level data of any
           type. It is mandatory that onne of the column contains
           gene-level ids

ids.column: the column of the df.tobe.annotated containing gene-level
           ids

Value:

      A data frame.



Cheers
Raf


-- 

----------------------------------------
Prof. Raffaele A. Calogero
Bioinformatics and Genomics Unit
MBC Centro di Biotecnologie Molecolari
Via Nizza 52, Torino 10126
tel.   ++39 0116706457
Fax    ++39 0112366457
Mobile ++39 3333827080
email: raffaele.calogero@unito.it
        raffaele[dot]calogero[at]gmail[dot]com
www:   http://www.bioinformatica.unito.it


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