Windows 7 Tip: 
Sun PDF Import Extension is a useful add-in for OpenOffice.org that enables you to modify PDF files when the original source is not available anymore. PDF documents are imported in Draw and Impress to preserve the layout and to allow basic editing. It is the perfect solution for changing dates, numbers or small portions of text. Native PDF forms are not yet imported.
The PDF Import extension will also enable the PDF export into a hybrid PDF file, which is a PDF with the embedded source file as ODF. Hybrid PDF files will be opened in StarOffice as an ODF file without any layout differences, while users without StarOffice can open the PDF part of the hybrid file.
Features:
* Text attributes like font family, font size, weight (bold, not bold), style (italic, not italic) are imported together with their respective text
* Retain font appearance, when a PDF file uses a font not installed on your system, the font is replaced with the best alternative font
* Converts images and vector graphics
* Each line in a paragraph is converted into one text object
* Import of password-protected PDF files
* Import shapes with default style
* Support for colors and bitmaps
* Backgrounds remain behind other elements
Not supported:
* Native PDF forms
* Proper paragraphs
* Processing layout of LaTeX PDF
* Import of complex vector graphics elements
* Conversion of tables
* Import of EPS graphics
* RTL (right-to-left) text/font support
Download Sun PDF Import Extension – Via [Ghacks]
That’s why OpenOffice is continuously getting users from MS Office
If you want to edit PDF files in their native form (which Open Office can’t really do) you may want to try this free PDF editor.
It can fill out PDF forms too, which OO can’t really do yet.