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Pursuing any avenue just for links is the wrong way to go about it. Press Release links have gotten hit bad lately because of their misuse and overuse... but if you have some news on your business that is actually PR worthy then shopping it around to respectable sites and getting your news out there to the right people can increase your qualified traffic. Same goes for guest posting. Its been hit bad lately but its not about the links per se. Getting your name out there, branding, sharing useful information or something humorous or poignant can help people learn who you are, increase your qualified traffic, etc. etc. and you don't need a followed link to reap the benefits. It also wouldn't hurt to look into social for branding and community purposes. And a product/tool/widget/infographic can also be a great way to gain links and/or spread via word of mouth/social mentions. But be sure not to go embedding any hidden links in sharable widgets or you'll get bitch slapped by Google as well. As Andy put it, creativity is the key here. There are so many ways of earning links, getting shared and being seen online that there practically is no limit to what is possible.