It seems to me that patent suit becomes more and more often nowadays.

New one: Sandisk vs other flash storage vendors:
http://www.news.com/8301-10784_3-9804488-7.html

Other on-going patent cases:
Broadcom versus Qualcomm
Nokia versus Qualcomm
SCO versus IBM over Linux
IP Innovation versus Redhat and Novell
Alcatel/Lucent versus Microsoft over MP3

Regards,
Xiaofan
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