I've bookmarked the insidetract site. For $100, when I start seriously looking, I suspect being able to drill down to the address and ascertain the floor layout without driving out will save massive amounts of time and frustration.
I'll also ask for and demand it from my REALTOR(tm), if it's $100/year, there's little reason for them not to have it IMHO and if they did, they could spend 30 minutes with a client figuring out what floorplans they were interested in instead of just shilling home that meets the bedroom count requirement.
OMG, the voice effects on the demo are hilarious.