Well, having a great PR agency with the right pr strategy and media relationships doesn't hurt... but what if you want to DIY PDQ? (Don't you just love all of the acronyms in this text message age?)
There's a great resource called PRtraffic.com that, for only $99 per month, will allow you to choose which topics you'd like to be a SME (subject matter expert) and play to journalists and writers who can give you publicity and search engine love. It also offers some great suggestions on how to stand out from the crowd when answering requests from the media. They get so many responses to their info requests that you really have to find a way to rise above the noise. I believe that their strategies and suggestions on how to craft your communications with the writers will definitely help your message to rise to the top.
For the purposes of being findable and establishing credibility and personality, getting mentions in print and online can help you tremendously. It also doesn't hurt to have the link love and the likely boost in page rank. Check it out to see if there are topics where you can be a SME...