Getting PR 3 may seem easy but try to get more organic and targeted traffic and sustain it. Because traffic is money...
theres a real mixed bag of reactions here. I say congrats, but... Try branching out from the directory listings now and get some links from some other sources. You mentioned that you were going to do some articles, thats great. Just make sure they are well written, informative and interesting. If you keep working on the site, but make sure you have links from all sorts of sources who knows how high you could get your PR.
Congratulations for the PR 3, My main site's homepage didn't get any PR raise though its inner pages did. The amusing thing about the PR is that a dormant two-paged site of mine, which hasn't even gotten a social networking script for it to function installed got PR 3 from PR 0. The links pointing to it were just from my main site and three other affiliate sites. I don't break my balls anymore about that dark green Google stuff. Just looking for ways to drive traffic and to earn money. Google measures others as if they're the Universal Internet Government. WHO MEASURES THEM? No punches pulled! Laughs!!!
Congrats. You've just proven PR is a relatively easy to get, therefore you should put your efforts elsewhere...