More or less we all use Google Apps for our virtual office needs. After Writely became Google Apps (you know the reason why), we did not get any alternate solution for our virtual office needs. But on the other hand software giant Microsoft also wants to capture some market share by producing similar apps and they came with Office Live Workspace.
I have no idea how many people use that application because still I could not make that working on deferent browsers, for example Safari or Opera. But unfortunately they got Webware 100 2008 award. Still I doubt how. :)
But there are other winners too, who really did great. You can take a look at the winners on this page.