At ArcGIS 10, ESRI is trying to further tie the ArcGIS brand with online integration. So they are launching ArcGIS.com, which from what I can gather is a fusion of ArcGIS Online and the ArcGIS Resource Centers. It is also intended to expand their efforts to make a community focused site, allowing more flexible sharing of maps and apps, and making it easier to discover both. I'm getting a little bit of a Microsoft Bing vibe from it.

Another exciting development is creating an online version of ArcGIS Explorer, named (you-guessed-it) ArcGIS Explorer Online. It is based on Silverlight and does many of the same things that the desktop version does, such as measuring, markups and the presentation mode. All that is required is to have the Silverlight API, otherwise no other components need to be installed. I was very impressed by the demo shown at the 2010 Dev Summit (http://www.esri.com/events/devsummit/videos/video3.html). I am curious to know if it will be a free deployable app like the Flex viewer or the desktop ArcGIS Explorer.