How are Hulu and other providers accessed if you are not connected via cable?
1) "Cable" (television programming)
2) Internet (Use mostly for web browsing (FF & IE Explorer)
3) Phone service
Roku replaces #1 by accessing it via #2 (streaming TV (Hulu, Netflix, Crackle, etc). #1 can then be canceled, saving some people $80ish/mo.