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The initial screen for the download crows that you've been selected for a technical preview of Microsoft Web apps for Word, Excel, and PowerPoint.
The standard choices for test-driving Office Web Apps require an installation, but the Home version requires less commitment.
Click-to-run enables Office 2010 Beta installation in just a few minutes.
Excel 2010 Beta includes full Ribbon and supports auto-fill.
The Excel version accessed through Office Web Apps has a truncated Ribbon and no auto-fill.
One issue with Web Apps Excel is that you can't modify or even move a chart, and can only edit the source data.
Here's another screen where we tested editing the 1Q10 revenue figure, which caused the chart to automatically update but didn't allow us to move the chart itself, change colors, add titles, or edit labels.
The dialog box allows you to enter a hyperlink.
In traditional Excel, typing a well-formed URL would have automatically turned into a hyperlink. Not so in Office Web Apps.