Any real Google enthusiast knows about Google I/O, the May conference where Google announces all its major upcoming projects and discusses its advancements over the past year. However, actually getting to attend I/O has become next to impossible. Maybe it’s the fact that announcements are getting bigger and better. Maybe it’s the hundreds in free hardware that are given to attendees. In any case, I/O sold out this year in under an hour. Luckily, those who want to watch the core information from the event can still do so.

The two most major items to watch are the day one and day two keynote addresses. While these addresses, as well as other presentations given in the “main room” of the event, were streamed live, YouTube now stores the keynotes. Additional videos constituting other important segments of the event have also been, and will continue to be, posted.

Day one’s keynote focused on Android, the Google platform for smartphones and tablets. Google discussed the re-combination of the 2.x (Gingerbread, for smartphone) and 3.x (Honeycomb, for tablet) lineups into the 2.4 Ice Cream Sandwich platform. Details beyond that were scarce, although it was stated that ICS should be expected for a fourth quarter release. Google also unleashed movie rentals in the Android Market, the beta version of Google Music, and the Android Open Accessory.

Day two’s keynote took a look at the obscene growth of the Chrome internet browser, which garnered 90 million users over the last year. Google also discussed other Chrome-related projects, including the Chrome OS and the associated “Chromebooks.” The HTML 5 possibilities, new apps, and in-app payments were all given their share of focus during the presentation.

Did you catch I/O live? What information or video is an absolute “must witness” element of the event?