Google with an operating system (Chrome OS) and Microsoft with a search engine (Bing).
What makes this battle all the more interesting is both the scale of the companies involved and the extraordinary differences in their ways of going about business. For all its size — and its occasional arrogance — Google still retains a willingness to experiment and risk failure in many directions at once. Microsoft, on the other hand, is unbelievably tenacious and holds an almost insuperable lead in market share. (NYT)