The Google I/O event in San Francisco kicked off yesterday, as a two day show taking place at Moscone West. 5,000 people from 66 countries will participate and they’ll listen to over 200 speakers, also witnessing 180+ developer demonstrations and participating in over 90 technical sessions, breakouts and chats.

Now, let’s see what Day 1 was all about:

HTML5 was shown a lot of love by all participating companies and speakers, so Steve Jobs was not entirely wrong when praising this technology. On the stage, Google demoed HTML5 and Gmail in Chrome, to show its power and we also saw MugTug in action, a photo editing software, everything centred on Chrome and the capacity of HTML5 technologies.

A new open source web video format was announced, WebM and it turns out that right now, YouTube videos are being converted for this project. Mozilla also shows its support for the new format, as well as Opera, who demoed WebM on its browser. Welcome to the age of the open, standard format for web video!

Next up, Google officials announced the Chrome Web Store, the ideal place for finding and buying applications to use online. Games are also included (stuff like Plants vs. Zombies, very popular on the iPhone/iPad) and tons of other web apps. Sports Illustrated was also demoed on stage, in HTML5 and the last part of Google’s presentation was all about business and cloud solutions.

VMWare and Google have partnered and will provide apps that run on clouds, either public or private. The two companies will bring an open-source layer for the cloud to the market, with VMWave handling the backend side of the biz. Google Web Toolkit and SpringSource have been integrated in the project. Last, Google App Engine for Business was announced, with support for SSL, SQL, forma SLA and pro support.

An important announcement was the one that Google Wave is not completely open to the public, without invitation, as part of the Google Apps suite. Google I/O continues today and if you want more info you can get it from Twitter (@googleio and hashtag #io2010) or from the show’s YouTube channel.

[Google Blog via Mashable]