I found ths map a particluarly interesting way of looking at the browser/OS/portal wars, with Microsoft at the center. Credit to: MShiltonj.

I would do some things differently – the map may give the impression that Microsoft holds a dominant position in certain areas such as iTunes/iPod and searching, when it does not. I would find it interesting to add other things outside of traditional “software” like media (the music/movies side) or gaming (Sony Playstation, Nintendo, Xbox).
I also would not call MSIE6 a “retreat” as much as a comfortable spot that Microsoft has not had to do anything to address until Firefox came along. MSIE 5.x on the Mac was a very bad product, I will agree.
Now what would be cool is to make it a clickable map that links to Wikipedia articles for each term…