I wouldn't have more then a few. There are plenty of ways to get free backlinks, plus it might be far better to focus on internal links before anything else, i would keep it down to select few, and possible only with people I've spoken to.
Some sites also have requirements to leave the code unmodified, which usually means using an outdated target attribute, and using that is just one of several bad-design practices.
Many of these directory owners don't really contribute with anything valuable, most of the sites are made to make money by selling links, so watch who you are linking to, you could end up linking to someone who only accepts Reciprocal Links and paid links.



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