By this time, you might think your yard IS the local dump. Just hope no one else gets the same idea.
Before the advent of restrictive fire codes, you could have burned your trash piles where they lay. As an alternative, you might wish to try burning the refuse in your fireplace. However, this can be messy. Some items, such as fiberglass or asbestos shingles throw off an awful odor and may leave a tar-like substance adhering to the fire wall.
Though more expensive than fire, dumps are an ecologically sound means of disposing of refuse. Some dumps charge by the gross truckload and others by the weight of the deposit. I strongly discourage dumping on old country roads to save money. Farmers are known to be unappreciative of such donations. I can tell you from experience that they are also quick with their shotguns.
The modern landfill is truly more than simply a dump. In many communities it also serves as a recycling and composting center. You may be able to get cold hard cash for some of the items you planned to pitch, for example: aluminum guttering and copper pipes. You won't be able to dent the mortgage payment with the proceeds, but it may be enough to surprise your wife with some flowers, or better yet, get yourself a pack of cigars on the sly. If you opt for the cigars, stay out of the house. A wife has a nose like a bloodhound. Even if she doesn't smell it, she is sure to find stray ash.
Beyond the whole ecology question, dumps are fun. While there you can go through what other people have thrown away. I have found the saying, "One man's trash is another man's treasure," is certainly true. Last time I went to the dump to rid myself of 3/4 tons of gypsum board, I found three bicycles that were missing a few parts. I rescued them and brought them home to add to my burgeoning collection of old bike parts. If I keep at it, one of these days, I am going to be able to put together an entire bicycle. My wife has no faith in me. She seems to think they will hang around forever the way the old lawnmower parts did. Little does she know that I am planning on combining the two piles of parts and coming up with…a motor bike.