How to Add A Wireless Laptop to a Wired Home Network

A member of our message board recently bought a new Wi-Fi laptop but wasn't sure about the best way to integrate it with their existing home network that uses a wired router. Several different approaches can work:

1. connect the laptop to the wired router with an Ethernet cable
2. replace the wired router with a wireless router
3. add a wireless router to the home network (and keep the wired one)
4. add a wireless access point to the home network
5. (not recommended) set up a PC on the home network to be a wireless bridge for the laptop

Any others?
→ Discuss - Adding A Wireless Laptop to a Wired Network
→ See also - Can Two Routers Be Used on the Same Home Network? and Do Routers Support Hybrid Networks?