The thing with these SEO tactics and techniques is that they keep evolving with some becoming irrelevant, and new ones popping up.
Some that haven't caught on with many include submitting pdf files to submission sites like slideshare or yudu or issuu. Another way you should think about is infographics but ensure they're great because if they are, they'll be shared and build your link portfolio. You should also think about exploring multimedia options: come up with interesting clips, presentations, and images about your products/services, their FAQs and usage. Share on picture and video sharing sites like the ones you know - YouTube, Flickr, Instagram, Slideshare you name it.
Speaking of which, did you know Instagram beat the likes of Facebook, Twitter and LinkedIn as the 2013 best platform for brands? Food for thought...