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Not that odd. About 5 years ago a certain subsidiary of a megacorp chaired by Uncle Rupert ripped about 60% of one of our sites (including the bugs).

Pursuing it became such a circus that after a time our CEO decided the effort was better spent improving our product. This turned out to be a good choice in the end as the impostors went nowhere and we went on to capture > 50% of the market.

Edit:

Sayeth PG: "The more slavishly someone copies you, the less dangerous they probably are."

Experience indicates this is nearly universally true, and today we devote considerably more resources to out-marketing, partnering with or acquiring businesses with winning points of difference.

It reminds me of the AOL.com redesign which was extremely similar to the Yahoo! frontpage at the time. http://i12.tinypic.com/2cyocw9.jpg

My copyright suit was with a major tech corporation that had been in business for 20+ years. They have since gone bankrupt, but it's not at all surprising to me that an established company would do something nasty.