Animal Crossing: Wild World

Become Friends with Blathers
If you talk to Blathers when he is depressed-looking, he will say that he detests bugs. Talk to him every day for a few days and he will explain how he is trying to overcome his fear, then how he finally gives up.
(Thanks to hamster_of_the_apocalypse@hotmail.com)

Become friends with Brewster
Once a day you can buy coffee at the cafe. At first Brewster just gives you coffee and says "Thanks...". Buy some from him every day, and he will start asking you questions, and asking you if he can put special ingredients in your coffee.
(Thanks to hamster_of_the_apocalypse@hotmail.com)

Become friends with Sable
Whenever you enter the Able Sisters store and try to talk to Sable (the hedgehog sitting behind the sewing machine in the back left corner), she usually just ignores you, or tries to tell you talk to her sister because she's busy. Talk to her every day for a number of days, and she will start having conversations with you.
(Thanks to hamster_of_the_apocalypse@hotmail.com)

Birthday Cake
Log into your town on your birthday to get a cake from one of your neighbors.
(Thanks to hamster_of_the_apocalypse@hotmail.com)

Get Feathers
You get these by donating to Boondox.
Blue: Donate 200,000 Bells
Green: Donate 10,000 Bells
Purple: Donate 1,100,000 Bells
Rainbow: Donate 6,400,000 Bells
Red: Donate 800,000 Bells
White: Donate 1,400,000 Bells
Yellow: Donate 500,000 Bells
(Thanks to hamster_of_the_apocalypse@hotmail.com)

Get Furniture from your Neighbor’s Houses
If an animal in your town has furniture in their house that you want, send sea shells or unwanted furniture to them in the mail. They'll usually put these gifts in their house, displacing whatever was there before. Check the recycle bin at your Town Hall to see if the item you want is there.
(Thanks to hamster_of_the_apocalypse@hotmail.com)

Get Items from the Snowman Set
In winter, create a snowman by rolling up the snowballs you occasionally see laying around. Push one on to the other to make a snowman of correct proportions. The next day, as a way of saying thanks, he will mail you a rare item from the snowman set.
(Thanks to hamster_of_the_apocalypse@hotmail.com)

Golden Axe
Trade a scallop sea shell to Pascal for the golden axe.
(Thanks to hamster_of_the_apocalypse@hotmail.com)

Golden Bug Net
Catch one of every type of bug.
(Thanks to hamster_of_the_apocalypse@hotmail.com)

Golden Fishing Rod
Catch one of every type of fish.
(Thanks to hamster_of_the_apocalypse@hotmail.com)

Golden Shovel
Bury a regular shovel in the ground, and then dig it up a full day later. It will then be golden.
(Thanks to hamster_of_the_apocalypse@hotmail.com)

Golden Slingshot
Shoot 15 items out of the sky.
(Thanks to hamster_of_the_apocalypse@hotmail.com)

Golden Watering Can
Keep the environment perfect for 16 days in a row. Pelly or Phyllis will reward you with the golden watering can.
(Thanks to hamster_of_the_apocalypse@hotmail.com)

Grow Gold Roses
Water dying, black roses with the golden watering can, and they will return as golden roses the next day.
(Thanks to hamster_of_the_apocalypse@hotmail.com)

House Upgrades
Back Room: Pay the debt of 848,000 bells.
Expand House (1st): Pay the debt of 19,800 bells.
Expand House (2nd): Pay the debt of 120,000 bells.
Left Room: Pay the debt of 598,000 bells.
Right Room: Pay the debt of 728,000 bells.
Upstairs Room: Pay the debt of 298,000 bells.
(Thanks to hamster_of_the_apocalypse@hotmail.com)

Make Animals Stay in their Houses
Go to the gate, and ask Copper to open the gates for DS to DS visitors. After the gates are open, your animals will stay in their houses. This makes deliveries easy or if you are trying to look at a certain animal's house and they don't stay inside much.
(Thanks to hamster_of_the_apocalypse@hotmail.com)

Money from a Rock
Hit all the rocks in town with either a shovel or an axe until you find one that releases a bag of money. Repeatedly hit it until it stops throwing up bags of money. This can be done daily.
(Thanks to hamster_of_the_apocalypse@hotmail.com)

Mush Items
Cornimer will give you mush furniture in return for acorns. You get acorns at the Acorn Festival.
Forest Floor - 230 acorns
Forest Wall - 200 acorns
Mush Bed - 170 acorns
Mush Chair - 40 acorns
Mush Closet - 80 acorns
Mush Dresser - 60 acorns
Mush End Table - 10 acorns
Mush Lamp - 25 acorns
Mush Stand - 100 acorns
Mush Stool - 5 acorns
Mush Table - 120 acorns
Mush TV - 140 acorns
(Thanks to hamster_of_the_apocalypse@hotmail.com)

Party Poppers
Speak to Tortimer during New Year's Eve.
(Thanks to hamster_of_the_apocalypse@hotmail.com)

Post Office Savings Rewards
Save 1,000,000 bells and receive a box of tissues.
Save 10,000,000 bells and receive a piggy bank.
Save 100,000,000 bells and receive Pelly's picture.
Save 500,000,000 bells and receive Phyllis' pictures.
Save 999,999,999 bells and receive a Town Hall model.
(Thanks to Gil)

Roman Candles and Sparklers
Speak to Tortimer during the Fireworks Show that takes place every Saturday in August, from 7-12PM.
(Thanks to hamster_of_the_apocalypse@hotmail.com)

Turnips That Never Spoil
Place a table in your house. Put your shovel (or other item) down in front of the table. Stand directly on that item and try to place your turnips on the ground. They will land on the table instead of the floor. This stops them spoiling.
(Thanks to hamster_of_the_apocalypse@hotmail.com)

Wishy the Star
On a perfect clear night look into the sky and wait for a shooting star. When you see one tap your character with the stylus. The next day you will get a special gift.
(Thanks to hamster_of_the_apocalypse@hotmail.com)