Companies are always fighting, but these caught my eye as of late
Twitch vs. YouTube
YouTube never really took advantage of gaming and now the big boys of video are in the game. Twitch seems to doing quite well still.
Apple TV vs. Google TV
The smartphones aren't really phones. Smart TV's won't be really TVs. These 2 titans are really going at it to be the next big platform
Facebook vs. Twitter
This isn't as obvious, but notice how Facebook has a lot more real-time news, following functionality, and hashtags?
Apple vs. Google on mobile
Android vs. iOS and the whole privacy battles on mobile.....oh boy....
Google vs. Yelp
Yelp wins on SEO. Google is cutting into that by doing it themselves
The list continues
Last few years I saw a lot of companies jawing at each other. The war now finally begins