Opening the doors to developers at Google I/O (photos)

This week thousands of developers are in San Francisco for Google I/O, the company's annual conference that focuses on a technology lineup that includes Android, Google Chrome, Google APIs, Google Web Toolkit and App Engine, among others.

A Google Maps place marker on the steps of Moscone West pinpoints the location of Google I/O, the developer conference that starts tomorrow in San Francisco.

Google I/O is now in its fourth year. The company has been tight-lipped about what it will announce at the show.

A stuffed green Android sits on a shelf at Moscone West, welcoming developers to the conference.

Aside from the regular conference swag like T-shirts, Google often offers generous gifts to attendees. In 2010, every attendee received an HTC Evo 4G phone.

Moscone West was already swarming with people picking up badges this afternoon, minutes after registration opened at noon. After conference tickets went on sale the morning of February 7, Senior VP Vic Gundotra tweeted that they had sold out in 59 minutes.

Picking up the coveted Google I/O T-shirts today in San Francisco.

Eric Kessel holds up his T-shirt to show off the colorful Lite-Brite-like design on this year's Google I/O shirt.

Prior to the show, Google keeps quiet about the specific content and announcements. Take a look at CNET's Android Atlas, where Scott Webster predicts a few of the announcements we might see at this year's I/O.

Inside Moscone West in San Francisco today shortly after registration opened at noon.

Tomorrow, Google I/O officially opens its doors at Moscone West.

CNET's team of reporters will be live-blogging the Google I/O keynote speeches beginning at 9 a.m. Tune in to see what Google has in store.