In case ulz_peter and others are interested, it turns out that GATK UG does not make indel calls for 454 data.
I also posted the same question here:
http://getsatisfaction.com/gsa/topic...#reply_7912928
(btw, this is a pretty good place to have GATK-related questions answered)
Now the wiki page for GATK UG clearly states this limitation:
http://www.broadinstitute.org/gsa/wi...fied_genotyper
Hope this helps. I'm trying samtools for indel calling now.