LinkedIn recommendations and video testimonials are two great ways to get people you've worked with, worked for and who you've made a difference with to tell people how wonderful you are.
Having someone other than yourself tout your greatness and your abilities is an easy way for others to find out what you really stand for.
For LinkedIn recommendations, the best way to get them is to give them. Find someone in your connections who has made a different and write a glowing recommendation. If you don't know what to write, check an email you may have sent to that person in the past complimenting them or read other people's recommendations.
For video testimonials, more people have access to video than ever; they can post it themselves to a YouTube channel or Vimeo channel, send you the video via Dropbox, or record it right on your computer.
Get out there by getting people out there telling the story of you!