It was a booklet produced by North American GW (IIRC, I never saw it get a release outside there).
In a nutshell it was a collection of senarios for both BFG and 40k (the 40k portion being boarding actions and stuff). If you haven't already got a copy you can find it on Scribd.com.
Actually I kind of forgot about this, going to have to give it a read at some point!