Can't do much more than point you in the right direction since I'm stuck myself..
When using information store backup you need to store the backup to a backup to disk folder to be able to restore individual items(this is where I'm stuck). If you don't use B2D you will first have to restore the database from tape to some folder and from that point have BE mount the database and restore the single items.
I guess GRT would be a good thing to add to your search keywords.
There is also this whitepaper that could give some helpful information..
http://eval.symantec.com/mktginfo/enterprise/white_papers/ent-whitepaper_redefining_exchange_server_data_protection_with_bews11d_11-2006.en-us.pdf
-M