Leveraging LinkedIn?

[Ben Ballinger]

Does anyone have a strong presence on LinkedIn, using it for posting materials, networking, etc as a significant source of their marketing efforts?  If so, any tips on getting started? I have had a linkedin account for like 5 years and have not used it at all since I've owned my own business, other than adding my facebook friends and connects (which is pointless because I never visit the site).

I would particularly be interested in any sort of tutorial type series geared towards investors on using LinkedIn, but also any personal tips and tricks are appreciated.