New domain and you're updating it regular basis. It's very good. Just keep going this process and hope on coming update you may achieve PR 2 or 3.
do it some link building example social bookmark article forum posting then wait 1 month your PR increase
I agree with above points because we know that fresh content is king online and Google like the fresh content on any website...Best of luck..
getting back links is harder than you think, a lot of sites have "nofollow" on links that you put on a thread.