Navarro's dashboard

I have an excel spreadsheet that I would like to display on the site but not as an attachment.
I know that I am currently required to download, edit, and re - upload, but how do i get the contents of the excel sheet to be displayed?

we are a tiny company - and i'm putzing around with a wiki to show upper level executives to show that it would be worth the investment. The main use of the wiki would be to share and co-collaborate on calendars and documents. I noticed the templates have a slight difference. What are the major differences between business and individual wikis?