This add-in is quite useful if you need to send your Office 2007 (Word, Excel, Powerpoint or even Publisher Files) in PDF format. I used to always use PDF995 but this add-in works seamlessly from Office 2007.
Office 2007 Add-in for Saving Files in PDF
This add-in only works from Office 2007 so if you're using an older version of Office, try PDF955. It works great and it works from any software including your web browser, email program, etc..