You can use Open Office to edit PDF documents directly.
Open Office is the open source version of MS word. It is free and can do all the things you'll ever need.
For PDF open Open Office first. In the menu click open file and click on the PDF file you want to edit.
You can import MS Word documents as well.
Use the export function to create PDF file formates from text documents.
Use the export function to create all kinds of file formates from PDF such as:
HTML
XHTMT
PDF Portable Document Format
SWF Macromedia Flash
BMP windows Bitmap
EMF
EPS
GIF Graphics Interchange Format
JPEG Joint Photographic Expert Group
MET
PBM
PCT
PGM
PNG
PPM
RAS
SVG
SVM
TIFF Tagged Image File Format
WMF
XPM