Hey Freetraff,
I have been doing SEO work for the past 2 years now, and it is my opinion that you will begin to rank very well over time with this link. Let's say that Page A has PR 5+, while Page B has PR3. If Page A is a site dedicated to growing vegetables while Page B is another site that is about growing vegetables with the Title tag "Grow your own vegetables", if Page A links (via anchor text "How to Grow your own vegetables" to site B on Page B, then you should expect that you have just got a real good boost of Page A's power. That is because you are now two sites that share a common category - this helps Google reach the understanding that you (as Page B) are playing by the rules, are who you say you are, and have a website that is telling the truth and are linking in from a site that not only is about your same category (vegetables) but also states in it's link to you that you are a resource for how to grow vegetables. You will have no problem getting high up in Google.

The big problem is getting a real good quality link from a website that isn't a over-populated directory since it is easy to buy a link, it is harder to deserve a link or create a partnership, and you will always have better results from a good honest partnership. (but I'm not saying directories are bad either, they are the bread and butter of link building!)

Go get your links and watch the site climb to the top of the rankings.

Scott Haines
San Francisco Bay Area Website Design