I definitely see the benefit and I'm frankly surprised no such freeware extenders/apps exist. I didn't even find any Word-compatible freeware editors that do this! That surprised me perhaps even more. I would expect for example OpenOffice to do this. As memory size increases and dual core CPU's become more prevalent, more and more people are multi-tasking and becoming "power users". This clutters up our task bars. Our work processes also tend to be "modal" - if we're editing documents, we probably want access to all the documents we're editing at a given time; they don't likely need to be individually accessible in our increasingly cluttered task bar. Tabbing may not make sense for all apps, but I definitely think it does in this and many other multi-document workflow cases.