Edit: if you're just reading this now, too late.
(pic via spawn031)
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Via Majornelson: 2012 Xbox LIVE Update Public Beta Now Available
Edit: It does NOT ask for your console ID or serial number or anything like that, so you can sign up from work. No need to wait until you get home.

(pic via spawn031)
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Via Majornelson: 2012 Xbox LIVE Update Public Beta Now Available
Numbers are limited, so sign up today. If you’re selected as a tester, an update will be pushed to your console once the public beta kicks off. The update will contain select dashboard features, including:
- Internet Explorer for Xbox
- Personalized dashboard recommendations
- Enhanced category search and discovery features
Note: A console in the program is expected to remain fully compatible with standard retail consoles not in the program.
If you would like to participate, please register for the 2012 Xbox LIVE Update Public Beta here.
Edit: It does NOT ask for your console ID or serial number or anything like that, so you can sign up from work. No need to wait until you get home.