If you have noticed that users are complaining about older documents (.xls, .doc, .ppt, etc.) not showing up in search, the problem is likely that the Office IFilters haven't been installed - the IFilters enable SharePoint/FAST Search to better index the document contents.
You can download them from here:
The IFilter has to be installed on the Front End server running Central Admin (ala where the Search Service lives).
Likewise for your PDF's, you need to download and install the Adobe PDF IFilter:
As well, if you want the neat little Icon to show up, you need to find a PDF icon that is 16x16 pixels. You can download the 'official' ones from Adobe here:
Copy the .gif or .png file into the SharePoint Images folder (c:\program files\common files\microsoft shared\web server extensions\14\template\images. Next, locate the DOCICON.XML file in the template\XML folder and add the extension - find the PNG extension, copy the line and add the PDF:
<Mapping Key="pdf" Value="pdf.gif" /> <-- add this line
<Mapping Key="png" Value="icpng.gif" />
NOTE: You must modify the DOCICON file on every front end server.
Note: If you are open to it, you can update the DOCICON file with a feature as Steve Goodyear outlines here:
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