Dear Maggie, this might be a good question for the kidney-onc list, as I know they have members there with bone mets. If you're not a member already, you can join on:
http://cancerguide.org/kofaq/
There is a vast amount of information from RCC patients there, though I warn in advance there are a LOT of mails, so you may want to create a separate email address for joining!
off hand, ther only drug I know of for bone mets palliation is Zometa.
All the best, Julie