Linkedin recently introduced a new 'Endorsements' feature. This is different to the 'Recommendations' feature which still remains and is something you can do quickly and easily. Many business owners have used Linkedin to connect to people and are not really using it as a powerful tool for interacting with these connections. You can now endorse the people in your network for their skills and expertise as a simple way of doing more.
Business relationships are built by a series of interactions over time and networks like Linkedin give you tools to interact in between the times you meet. Helping others meet their business goals motivates others to do the same for you so why not get in the habit of endorsing the people within your network that you rate. You'll be helping them and others will endorse you for the skills and expertise you promote.
Take a look at this brief presentation from Linkedin on how the Endorsement Feature works.
As you endorse people then you will also get more visitors to your profile so take advanatage of the new facility to embed presentations and videos on your profile. You can see where I have added these in the Background Section of my profile on Linkedin in this screenshot below: