Free PowerPoint to PDF Creator
Microsoft Office 2007 Add-in: Save PowerPoint as PDF
This is available to users of Genuine Windows running Office 2007. One benefit of this product over the converters listed above is that it preserves hyperlinks and bookmarks, and will automatically build bookmarks from headings. This is now included by default as of Office 2007 Service Pack 2.
Size: 933KFree Trial
Google Docs download as PDF (No need download)
If you just need to save a PowerPoint presentation as a simple PDF file, so you can share it online or send by email, then you can use Google Docs.
Primo PDF Creator
Create PDF files from 300+ file types and optimized for print, screen, E-Book, or prepress.
Size: 7.34MFree Trial
PDF Creator (Open Resource)
PDFCreator easily creates PDFs from any Windows program. Use it like a printer in Word, StarCalc or any other Windows application.
Size: 16.76MFree Trial
Open Office export as PDF
OpenOffice.org 1.1 introduces the one-click PDF export feature that enables you to easily create PDF files without the need for any additional third party software. This feature makes exchanging documents in a standard "read-only" file format a trivial task. The creation of PDF files normally requires relatively expensive third party add-on tools. With OpenOffice.org this feature comes for free.
Size: 127MFree Trial