Make sure you have done your keyword research and are
targetting LOTS of keywords including the long-tail ones.
Ensure your site is structured correctly around these, then
get lots of related backlinks to your site's pages using the
keywords & keyword variations relating to those pages.
Articles are great for building up credibility, traffic and backlinks.
Use Web2.0 sites (forums,videos,groups,social networks) to find
targetted groups of people.
PPC is good but expensive & very hard to profit from due to
the competition these days and other marketers clicking your links.
Traffic exchanges will get you traffic but it's generally not the
sort you're after, but can be good for testing ad conversions and
building lists.
In general, take a little time to consider who your ideal customers are
and think whereabouts they will be hanging out online and how they
will be looking for what they want. Then position yourself right in
front of them and offer them what they're looking for. Market and keyword
research is everything!
Hope this helps a bit
getting traffic that will convert 
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