I came across this site which provides you with a cool feature to Convert your documnts/images to .pdf format by uploading it to the site. Quite a number of common document formats such as .doc, .ppt, .txt, .rtf are supported as wel as some common image formats such as .jpg, .gif, .bmp, .tiff are supported.

The maximum upload size of a file is currently 2.0 MB and you have to provide it with a email address for the .pdf to be emailed back to you.