Slideshare, a service often referred as "YouTube for Presentations", has expanded beyond PowerPoint slides into other territories like Word documents and Excel spreadsheets.

You can now upload both .doc and .xls files on to SlideShare in addition to PDF and ppt format.

This brings Slideshare in direct competition with other document sharing services like Scribd, DocStoc, Zoho Share and, to some extent, eSnips.