Firedreamer,
I use google docs for most of my commonly accessed and frequently edited word docs and spreadsheets. But there are a number that I keep in excel only due to the nature and complexity of the spreadsheet. Can ipad run an excel app or an excel-compatible app (open office??)?
yes, there are a number of apps that allow you to read and edit word and excel documents. I use an app called "office2 HD". It can connect to your Google docs folder and it allows you to edit your word and excel docs. Of course, you can also edit your Google docs directly in your internet browser too, by simply logging in to Google docs in Safari.
Edit: Office2 HD is a mobile app so you may not have access to some of the more advanced functionality of the desktop version of Word and Excel.