doPDF is a free program which lets you create PDFs out of any printable workspace (eg.: Word, Excel).
It works as a Virtual printer, meaning you create PDFs via the usual "File"->"Print" step, where you select the doPDF virtual printer "device", which then does not print on papers, but creates a PDF document on your PC.
It also allows you to convert to PDF from a big variety of file types (DOC, DOCX, DJVU, XLS, XLSX, XPS, PPT, PPTX, DOT, EML, VSD, PUB, PUBX, MPP, WPD, OpenOffice, DWG, HTML, TXT, PNG, JPEG, GIF, TIFF + a few hundred more).
One interesting fact I found when installing it was the extra multi-language support, where I counted over 30 available languages (but then again, it really isn't that text rich tool!).
Anyway, excellent tool. Fast, stable, and does indeed save time when doing that annoying office work + it is free.