Use Google Viewer for viewing different Gmail attachments
You can have a quick view of the images sent to you as attachment in Gmail and then download it on the fly. But what if the attachments are not images but PDF files? Previously Google used to convert the PDF files to plain HTML with the images excluded for your quick view which didn’t look much appealing. But now you can view PDF, DOC and PPT attachments very easily from Gmail using the Google Docs Viewer.