Effective Resume Writing
Many companies (especially the larger corporations) will use computer software to "read" all the résumé's and reject any that don't fit a particular template. This may seem unfair, but it's cost effective.
So, for some jobs you have to beat the computer and still read well enough for someone who may not have any knowledge of the position you are applying for. It is definitely worthwhile to adapt your resume for the position that is advertised. There may well be some of the "buzz" words the "filter" is looking for mentioned in the job description. It is very important that you can substantiate all the claims you make, preferably with physical examples or letters. This will be essential in any in interview situation.
There is now a wealth of information available online, from books, local employment offices and with professional writing agencies. You can also access other people's résumé's that are posted online which will give some great ideas for style and content.
Professional writers may seem the answer, but, all the research I have done seems to lean away from them.