There’s probably about three people out there who are interested in this, but here’s an OS X system service (.zip) that converts documents to pdfs.
It uses LibreOffice, so you need to have that installed, and it supports everything from text files to .doc, .docx, .odt, .ppt and .pptx.
You need to edit the line
mv "$f" /Users/YOURUSERNAME/.Trash/ so that it fits with your user name. The rest of the installation might be as easy as unzipping and double-clicking the file, but I’m not sure. In case you need assistance, here’s how to install a system service on OS X.
Simply select the files you want to convert, wait a second, and they should all be there as .pdf files. The Service moves the original files to the trash.
Thanks to the person who posted the script line I used for this on stackoverflow.