Resumes – Word or pdf Format?

Some debate exists around whether you should submit your resume in word or pdf format when applying online.  My contribution to the debate is, read the job advertisement thoroughly.  A significant number of ads state that your resume should be submitted in word format only.  This is one of a number of costly mistakes people make when applying for jobs.  If you are not submitting your resume in the requested format, not reading all of the material provided, not following the specified application instructions, or not downloading or requesting the position description, you are sabotaging your chances of success.

What do you not do, that you should be doing when applying for jobs?