In PR/PA anno 2010, the web is acknowledged as being an absolutely integral part of the communications mix, but quite often for the wrong reasons. PR professionals who view their job through the prism of media relations have transferred their thinking to the web, but replacing journalists with bloggers and the like. They view the opportunity purely in having more influencers to tell a story to; they’ll even ignore the web entirely if they find there aren’t high-profile bloggers interested in their issue.
To be honest, it’d be tricky to run a blogger relations campaign or build community on most issues. Sorry, but there just isn’t enough critical mass yet. That doesn’t mean the web has no value in these instances though! We’re moving from a world of push to one of pull. People’s first point of call? Google. So when they do search, you need to have a presence: and an impressive one at that. So forget about the external influencers for just a second and start thinking of yourself as one instead. You reach the end-user DIRECT through search. Grasp the opportunity.
p.s. and even if your issue could warrant a blogger relations campaign or a community-building approach you STILL need to build a great presence before engaging, or you won’t be taken seriously (the four pillars of online engagement maps out the steps in a little more detail.)
Steffen Moller 
You’re absolutely right. It’s important to develop a consistent and useful presence. It takes time and effort to rise to the top of SERPs but the results are invaluable.
To garner links, being a resource is a vital strategy.
Being a resource is only possible if they shift the focus from their own needs to the needs of their audience(s) and that can be a stumbling block.