According to Nick Kellet, up to 30% of Web Content is in the form of Lists because they are popular with people! The problem with lists though is that they are almost instantly obsolete. List.ly fundamentally changes this dynamic. As people engage with your list they add new, fresh content. Other items can be added or nominated to the list. Voting can show changes in trends over time as well.
List.ly has SEO Benefits!
List.ly posts are dynamic. When you embed them on your site or blog the content changes. Google loves fresh content and the spiders keep coming back to your page. Given the nature of Crowd Sourced user content, List.ly posts tend to rank for many long-tail keywords around a topic area.
List.ly enables engagement!
Funny thing, once someone add or votes on a list they have a tendency to come back and monitor it. They adopt the list, take some ownership over it. The format helps to spur conversation and interaction within a community. List are fast, easy, fun and very extensible. List.ly can handle many smart media formats such as Video, Prezis, and Slideshare. The ability to easily embed rich media (without the need for any technical knowledge) fosters sharing.