Paul Allen, co-founder of Microsoft, is suing eleven companies over alleged patent infringement.

Xerox has filed suit against search giants Google and Yahoo!, alleging infringement of patents held on knowledge management and automatic query generation.

A lawsuit brought against Microsoft for its Windows Genuine Advantage technology - described in the claims as "spyware" - has failed in its bid to be granted Class Action status.

Apple is seeking a permanent injunction against hackintosh retailer Psystar following a summary judgement against the company - and is also looking for monetary damages.

Eolas - a patent-holder which won a multi-million dollar judgement against Microsoft a few years back - is again suing some of the biggest names on the 'net for patent infringement.

The law firm who represented file sharer Jammie Thomas-Rasset is now on the other side of the courtroom, accusing sharing site Scribd of infringement.

Apple has been targeted by chip design firm Elan Microelectronics for allegedly violating a patent on multitouch technologies with the iPhone and iPod Touch ranges.