Well, I finally got Berry411 to work by manually uploading the following files:
net_rm_bbapi_pm.cod
net_rim_bbapi_mailv2.cod
net_rim_pdap_resoureces.cod
net_rim_serialformats.cod
So, bolstered by my success I installed bbtoday and the first thing the Apploader did was remove the 4 files I had just put in!
What gives with that????