Multi-Purpose EasyCard 2015-04-23
The EasyCard is mainly used as a method of payment for transportation, with public bus, intercity passenger bus, railway, and shipping all seeing use. In addition, some stores have also allowed for EasyCard payments as well, with favorable discounts. EasyCard is really quite convenient, here's a list of places where they may be used: 

Ordinary card example: 

1. MRT:  Entire Taipei MRT line, card holders enjoy a 20 % discount. 
2. Bus:

      a. Taipei City, New Taipei City, Keelung City bus (card holders enjoy a 20% discount)
      b. Taichung City bus 
      c. Yilan County 241, 261, 262, 281 no. buses 
      d. All buses in Kinmen County, Lienchiang County buses and transportation boats 
      e. Tainan City, Kaohsiung City bus 
      f.  Hsinchu City electric bus during the implementation period, can be used for electric bus no. 55, 55 local, 57 , 57 local, 70, 71, 72, 73, 75, 76, 77, 78, 79, 80, 81, 90, Expo 1, Expo 2 , 3, 5, free ride with an EasyCard swipe. 
3. Railway: split into north and south sections, within each section you may ride any vehicle you wish. 
4. High speed rail: Go on HSR's website and apply for a joint card. Currently 8 stations are in operation: Taipei Station, Banqiao Station, Taoyuan Station, Hsinchu Station, Taichung Station, Jiayi Station, Tainan Station, and Zuoying Station. You can enable automatic value-adding on the joint card and ride on the free-seating carriage. No cross section usage when entering and exiting stations. 10 percent discount for shuttle tickets. 
5. Passenger transport: Most intercity buses throughout Taiwan accept EasyCard payment, however some don't. Therefore before riding, it is reccomended that you find out beforehand whether the bus accepts EasyCard or not, and be mindful of your remaining balance. 
6. Public biking: Youbike (Taipei City, New Taipei City, Taichung City, Changhua City), New Taipei City to Taipei City riverside bikes, Tainan City tourist bikes. 
7. Taxi: In Taipei City and Taoyuan City, taxi cabs with an EasyCard sticker can be paid using EasyCard. 
8. Shipping: Taipei (Danshui, Dadaocheng, etc..), Lienchiang transportation boat, Kaohsiung City ship, Kinmen transportation boat. 
9.  Aviation: domestic flights from TransAsia Airways at Songshan Airport, Magong Airport, Kinmen Airport, Kaohsiung Airport, Hualien Airport. At the Taipei main office and Kaohsiung branch office, you can use the Easy Card to directly buy a domestic ticket. If the remaining funds are insufficient, there are also services on hand to help you replenish. 
10. Adminisration fees and hospital registration fees: mainly implemented in adminstrative areas and large hospitals in Taipei City. In addition, EasyCard can also be used to pay small administrative fees in Keelung, Taoyuan, Changhua, etc..
11. Leisure and relaxation: Taipei City Zoo, as well as Taipei City, New Taipei City, and Yilan County public libraries. 
12. Parking lots: Taipei City and New Taipei City's public parking lots, MRT parking lots, and private parking lots. 
13. Special shops: convenience stores, supermarkets, coffee shops, department stores...any place with an EasyCard logo means that you can pay using EasyCard. These stores are extended throughout Taiwan, but don't always carry out discounts.