The upshot of creating logos for Google that Google is an extremely popular search engine, receiving several hundred million queries a day, so any artwork on the google search main page will receive a lot of attention, and often Google will include a link to a google search of the holiday or birthday of whomever they are honoring in the logo.
Another sweet thing that the google holiday logos webpage has added is a fan logos page, which means that not only can Hwang contribute logos to the web giant, but anyone can. These won't be displayed on the main page, but it still includes the user-contributions and interactivity that is an aspect of a lot of digital New Media Art.