I can't comment on the interactive CD, but I bought a DVD off Ebay on the subject of Air Law and Operational Procedures, and didn't find it terribly useful for memorising the subject.
Also, as a word of warning, it appears that the DVD was a ripped off copied version.
I was tempted to buy interactive CD roms, but after forking out for both the Trevor Thom and Pratt books I decided to give it a miss.