Have you ever needed to create a pdf? Maybe someone didn’t have Word or Excel and needed a file from you, or you wanted to restrict editing. Adobe Acrobat does this, but it isn’t free. FreePDFconvert.com is. It allows you to upload a Word, Excel, or PowerPoint document and then have it automatically converted and sent to your email address. It can also convert from PDF back to Word or Excel, if you need to edit something. If you are using a Mac, you can just select PDF>Save as… from the print dialogue. On Windows, you could install PrimoPDF or PDF995 to do this for you.
UPDATE: PDFhammer.com provides an online editor- upload the PDF, edit in your browser, and download again.