I had already tested Writely, which I like a lot, so I tested Zohowriter. I had no problem importing existing Word documents but I feel that Writely does a better job of emulating a real word processor.
I also tested Thumbtack, an online presentation system. There is no current ability to import Powerpoint slides. Slides must be created from scratch and there is not way to include graphs from a spreadsheet although one can import images.
I look forward to using these tools on a daily basis and see what works and what does not.