By now most people have heard of YouTube. It has become extremely popular because people can view all different kinds of videos. They can also comment on them, email links to friends and add their own videos to the site for public consumption. Another popular but lesser known site is Flickr, whose popularity is built on sharing photos in the same way YouTube does videos. And there are a host of other sites built on the same social premises of allowing anyone to view, comment on and add content for all to see on the web.
While not nearly as popular, Slideshare.net can sort of be viewed as the YouTube for Powerpoint presentations. If you are looking for information you can incorporate into your website or blog, there's a good chance you can find it on Slideshare. If you put together some interesting presentation you can upload it to Slideshare and have people view, comment on it. Slideshare even makes it easy for those people who like your presentation to incorporate it into their blog or website. And each time someone views your presentation SlideShare keeps track of it. If it's really popular your presentations can show up on the Slideshare.net homepage, bringing your site a whole bunch of traffic, and potential customers.
This is a great way for you to expand your presence on the web by showing off your knowledge and experience by using a tool you're already familiar with. And don't be worried about someone "stealing your good ideas". The more you are able to create and publish on the web the bigger the pool of prospects becomes. This will far outweigh any negatives you may think of. So do yourself a favor and check out Slideshare.net.