Mariner Software announced at WWDC 2008 that they'll be resolving at least part of that dilemma with the release of Mariner Calc for iPhone. Mariner Calc is the software firm's popular Excel-compatible spreadsheet for the Mac.
Mariner Calc for iPhone is about 80% of the way to completion at this time and is expected to ship about the time the virtual doors open on the App Store. If you like to work on huge spreadsheets, you'll love this app since it sports a maximum of 1,000,000 rows and 32,000 columns.
Mariner Software President Mike Wray mentioned to Macworld.com's Dan Frakes that Mariner Calc for iPhone will support multiple sheets per document, charts, and objects. It's expected that the application will integrate with new versions of Mariner Calc for Mac. No price has been set for Mariner Calc for iPhone, but expect this little spreadsheet to be a popular purchase from the App Store.