Microsoft Office 2010
Microsoft Office 2010 adds the ability to save office documents in PDF format. The most widely used application that can benefit from this functionality would be Microsoft Word. Create your favorite Word document and save as PDF. Simple as that..!!

This is not a part of the list. Just want to remind people who have Office 2010 can use this functionality free of cost. No extra software required.

PDF to Excel

PDF to Excel lets you to quickly and easily create highly editable Excel files which can then be used Microsoft Excel, Open Office, Wordperfect Office and Google Docs format.

PDF to Word

PDF to Word lets you quickly create editable DOC/RTF files which can be used with Microsoft Word, Google Docs, OpenOffice and Wordperfect.

Web2PDF

Web2PDF lets you convert any webpage to PDF document. Just insert the webpage link and the web service will create a PDF file, also giving you an option to open it using Google Docs.

I Love PDF

I Love PDF helps you split and merge PDF files for free. You can use PDF file up to 8 MB in size. For PDF merge, you can use 10 PDF files at one go.

PDF Hammer

PDF Hammer helps you do basic online PDF editing stuff. You can edit any PDF file, as long as its security permissions allow it. You can combine pages, delete pages, rearrange pages, edit document information (meta data) and add passwords to it.