I also voted "other" to represent web. This is my most used platform actually.
I use several tabs for different documents, so the Windows app is not the core for me. (Would be different if tabs are introduced there).
As for Android, it is crucial for me as well, if I am to adopt DL fully. I can't use it until I upgrade my 4.2.x phone next month. But full use of DL will mean I use Android app almost daily.