I don’t have the links for all the Google DevFest slides but a few ones I can share and some extra information. Also you should see some of the presentations in a fancy modern webkit based browser for the correct view of transitions and animations
Eric Bidelman (@ebidel)
So What’s a Web App? Introduction to the Chrome Web Store http://www.slideshare.net/ebidel/so-whats-a-web-app-introduction-to-the-chrome-web-store
HTML5: Building for a Faster Web http://www.slideshare.net/ebidel/html5-building-for-a-faster-web-5635959
HTML5 Storage at #SenchaCon: http://html5-demos.appspot.com/static/html5storage/index.html
Patrick Chanezon (@chanezon)
What’s new in Google App Engine and Google App Engine For Business http://www.slideshare.net/chanezon/gdd-brazil-2010-whats-new-in-google-app-engine-and-google-app-engine-for-business
Google Storage, Bigquery and Prediction APIs http://www.slideshare.net/chanezon/gdd-brazil-2010-google-storage-bigquery-and-prediction-apis
Ernest Delgado (@edr)
http://kurrik-slides.appspot.com/html5-techtalk/
Ossama Alami (@ossamaalami)
Google Maps API v3 http://oa-samples.googlecode.com/svn/trunk/presentations/devfest-2010/buenosaires/talks/maps-api-v3.html
New Features tools http://oa-samples.googlecode.com/svn/trunk/presentations/devfest-2010/buenosaires/talks/new-features-tools.html
Ryan Boyd (@ryguyrg)
Google Apps APIs: https://docs.google.com/present/view?id=df2437c3_23p645mjdq&pli=1
Apps Marketplace: https://docs.google.com/present/view?id=df2437c3_25wkgvsccr
OpenID + OAuth: https://docs.google.com/present/view?id=df2437c3_24cjqdn8fz
Extras
Crossbrowser polyfills by Modernizr at GitHub: https://github.com/Modernizr/Modernizr/wiki/HTML5-Cross-browser-Polyfills/
What should a developer know before building a public web site? http://stackoverflow.com/questions/72394/what-should-a-developer-know-before-building-a-public-web-site/
