Speed is a good enough reason to switch but:
1. The address bar search has to be one of the best things about it. Nothing makes non chrome users jaw drop when they see me type wik google chrome and watch the chrome page load up. Same for youtube and most other big websites.
2. New tab page is awesome, thumbnails of my tabs and the last visited sites is awesome (they screwed this up recently requiring 2 clicks instead of one)
3. Incognito mode does not close my main browser without asking me like firefox does
4. Does not crash often, i work using the UnityWebPlayer which will often cause browser crashed, yet when the unity plugin crashes in chrome it doesnt take tehw hole browser down with it.
5. PDF native, wow, the first time i read this in the news somewhere i instnatly upgraded my chrome and ditched whatever pdf reader i was using. Now i even open downloaded pdfs in chrome and it streams(!) pdfs.
6. Angry birds! and other assorted games in the app store.
7. moving tabs around is soooo much nicer in chrome