Intriguing new Web 2.0 site for sharing presentation slideshows, SlideShare.net, went live this week. Currently in invite-only beta (natch), the site enables you to upload PowerPoint or OpenOffice slideshows of up to 20MB in size and then, in their words, "share with a link, embed in a blog, discover interesting slideshows, tag, comment and have fun". I uploaded an 11MB .ppt of some of my most popular Flickr photos. Apart from mangling my choice of font (Cooper Black), the resulting Flash rendering was pretty tidy. The interface owes a fairly big debt to YouTube, although I guess they figured there's no point in reinventing the wheel. Will be interesting to see what people use it for and how it scales up. Looks pretty promising.