Not everyone uses Google Docs, but most of us use Gmail. Now Google Docs supports 12 new file formats. This is not a good news for just professionals who use Google Docs, but also to those of us who use Gmail for file sharing.
Now you can send
Microsoft Excel (.XLS and .XLSX)
Microsoft PowerPoint 2007 / 2010 (.PPTX)
Apple Pages (.PAGES)
Adobe Illustrator (.AI)
Adobe Photoshop (.PSD)
Autodesk AutoCad (.DXF)
Scalable Vector Graphics (.SVG)
PostScript (.EPS, .PS)
XML Paper Specification (.XPS)
via email and it can be viewed directly on your web browser and need not be downloaded to your hard disk drive.
You can even upload all the files with above mentioned format to your Google Docs account and share the link across the web.
Source: Gmail Blog
if you have a file on your desktop with above mentioned file format and don’t have proper software to open it, then simply goto your Google Docs account, upload it, view and/or edit it.