I think being aggressive with your list price means being at the top of the search results when buyers and their realtors are reviewing inventory. It doesn't mean pricing it below market value...it means pricing it so buyers see it's value. A typical buyer or their agent will search all similar properties (ie. 3/4 br, 1 or 2 baths, neighbrhood, condition, etc) in a particular price range with maybe a $50,000 spread (this spread gets wider as the home prices increase). From the results of perhaps 15 available properties, they look for the top 4 or 5 that have all the features they seek. You and your realtor need to determine which homes in your area make up the Top third of properties in a particluar range and price your home competetively against them. These are the homes that will be shown consistently, and if your home is priced aggressively, the value will show. Of course, for this to be effective you have to have an honest assessment of your homes current condition and have faith in your realtor's market analysis of the property.
The bottom line is...don't list your home at a price you are unwilling to accept. If you price it right, it will sell and you might be pleasantly surprised at the result. You can demonstrate value and create a sense of urgency for buyers without giving away your home.