I was interested to see your advertisement for (position) in (paper) / on (site).
I noticed with interest your advertisement for (position) in (paper) / on (site)
I am applying for the position of (position), which was advertised (date) in (paper).
(Name) advised / informed me of a (position) that is available at your company.
I was referred to you by (name), who informed me of a (position) that is available at your company.
(Name) informed me that you are / your company is / (name of the company) is looking for someone with (skills).
The position seems to fit very well with my experience / education / background / skills / career interests / ...
I am very interested in applying for the position (of ...)
My experience / education / background / skills / ... make me an ideal candidate for the position.
I have the experiences / skills / ... you desire (in your advertisement).
From my enclosed CV / Resume you will find that my experiences / skills / ... meet the requirements you have outlined for the position.
I believe that my enclosed CV / resume will demonstrate that I have the experiences / skills / ... you seek.