PageRank is not a factor only of the quantity of incoming links, but also of their quality. You'll get more PR if you're linked to from a PR 9 pages than if you're linked to from one, or several PR 1 pages. A high-PR page passes more PR... so not all links are created equal.
Think of MarketLeap's link popularity count as being a completely unprocessed, unrefined number. The true value of your incoming links only becomes clear when you have categorized all of your links based on what sites they come from.
-- Jeremy Maddock SEOMix.com - Search Engine Optimization Tips My Blog - Business, tech, and politics from a webmaster's perspective
How does one go about getting quality links? It seems as though it comes down to basically asking the websites for links or am I wrong?
Basically you are correct. One way I ask for links is to put a comment on every one of my pages asking some people to link to the given page if they think it would be useful to others. It is a great way to get free links as lots of people are happy to provide links to their favorite pages and websites without asking for anything in return.