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It’s hard to remember a week with so many big tech companies staging so many potentially big announcements. It kicks off at 9:30 a.m. Pacific time Monday  morning with Microsoft’s annual Xbox news conference at the E3 video-game convention in Los Angeles.

Half an hour later, Steve Jobs & Co. will take the stage for the much-anticipated keynote address at the company’s Worldwide Developers Conference in San Francisco.

Who will win? Check the top of Techmeme around 11 a.m. or so to find out.

We actually know quite a bit, officially, about what Apple is planning to announce, or at least the products it will make announcements about. The company said last week that it would unveil Lion, the next version of Mac OS X; iOS 5, the next version of its OS for the iPad, iPhone and iPod touch; and iCloud, the company’s “upcoming cloud services offering,” which is presumed to include some sort of cloud-based music service.

Less is known about Microsoft’s planned announcements, but the company is widely rumored to be cooking up a subscription-based television service for Xbox Live, potentially making use of the company’s existing investments in its Mediaroom IPTV technology. It would be the latest move into entertainment for the Xbox 360, part of a continued effort by Microsoft to use the console to improve its broader position in consumer technology.

It’s also a chance for Microsoft to thumb its nose at Google’s Eric Schmidt, who last week all but dismissed the Redmond company as a provide of consumer technology platforms.

[Previously on GeekWire: Platform or not, Microsoft’s Xbox business is booming]

But E3 is about video games, first and foremost. Among other things, we’ll be paying close attention to how game developers are using and innovating with the Kinect motion-sensor in their games. Microsoft will be webcasting the E3 press conference starting at 9:30 a.m. for anyone who wants to follow along.

Microsoft and Apple are just the beginning of a big week in tech. Monday evening at E3, Sony will be taking the stage. On the agenda is the unveiling of the company’s new portable game system, code-named the NGP. The webcast starts at 5 p.m here.

Nintendo takes the stage Tuesday morning to unveil the successor to the Wii, expected out in 2012. That webcast starts at 9 a.m. here.

Back in Seattle, will be holding its annual shareholders meeting on Tuesday morning. Usually not a stage for big announcements, but it has been a busy year for the company — from tax battles to product launches — so CEO Jeff Bezos will have a lot to talk about. Who knows, maybe he’ll spill the beans on those Amazon Android tablets.

Follow the Amazon webcast starting at 9 a.m. Tuesday morning here.

Check back with GeekWire throughout the week for coverage.

Photo of Jobs from 2010 WWDC by BenM via Flickr.

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