How do I increase my Pagerank?

Ok, I think I’ve worked out why I thought my AdSense ads aren’t targeting. I checked Google to see how often it is crawling my site and it is only crawling my site every 2-3 days. I think this is why when I look at my most recent posts Google is displaying generic ‘blogging’ ads, while my older posts are getting some targeted ads. This isn’t much use to me as most of my readers tend to read my newer posts.

I think one of the reasons why I’m getting crawled so infrequently is because my Pagerank is so slow- it’s an embarrassing 0. How can I improve it quickly? I’m not sure what kind of links to my site count, as Connected is linked to from a number of sites via trackbacks, both created by me and also from other sites, but these don’t seem to be counting.

Do I need more sites to link to me from within posts? Or do I just have to be patient and wait for Google to pick up these links/see that I am posting frequently? What else can I do to increase my Pagerank? All help appreciated.