SlideShare is online tool to upload and share presentations. Very much like what Youtube does with video. The presentations are uploaded with some metadata (tags, tittle and description) and the content is searchable. Once the presentation is uploaded you get a direct link to it and the possibility to embed it in webpages (like the blog). From the webpage you can also start a full-screen view that allows you to present the slides from any pc with net and a browser. The only complain so far is that it did not convert the animations I had in the slides but they should be working on it.
I gave it a quick go with some slides of mine. Jokes on my poor design skills are not very welcomed :).