ArcGIS.com is a great online GIS tool. Earlier this year, Esri had to remove the Microsoft Bing base maps that were previously available to users. All conspiracy theories aside, this was a huge blow to online data collection. The Bing imagery is crystal clear and while second to Google in overall coverage, In a few areas the quality is actually far superior. As well, Esri does not have a good imagery-plus-streetname basemap similar to Bing's hybrid map.