Cool & Useful (Product Heuristics)

What do you do if your product or service is not loved by customers? What determines that the stuff you buy actually gets used? Where is the line between shelfware & wonderware (okay, I made this term up, but you get the idea).

Here is another one of the heuristics / rule of thumb (okay, rule of thumb & a finger) that came out of one of the rants on what can we make that folks would love.

Hope this makes sense.