DWF Writer 2
The Autodesk® DWF™ Writer is a certified Microsoft® Windows® system printer driver, so you can publish DWF files by simply selecting Autodesk DWF Writer from your standard Printer Name drop-down list in any Windows application.
The DWF Writer also works with other CAD applications that do not offer built-in DWF publishing, such as Bentley® Microstation and Solidworks®.
DWF™ Writer requires one of the following operating systems: Microsoft® Windows® XP Home or Professional; Windows 2000; Windows 2003 Server.
I even showed in a past post that I could produce DWF from MicroStation as well as even the old AutoCAD R12.
Update: Some such as Bentley may not want you to know you can print to DWF from their products as they removed my response to a post asking about DWF support in MicroStation on their discussion group mentioning the DWF Writer. In any case if someone wants to know if they can print to DWF from MicroStation, the answer is yes and it is much smaller than a PDF which is better suited for Word documents instead of design documents. There is a small free viewer available for download. The free DWF Viewer is located at: http://www.autodesk.com/dwfviewer-download
Give DWF a try you may find you prefer the DWF format for exchanging design documents more easily and in most cases much smaller and more visual fidelity than other electronic formats designed for other purposes.