For me, the best part of Svbtle is it's management and writing interface. They are geared towards getting you to write more. By considering drafts as 'Ideas' rather than actual posts, a huge mental block is released. Now you just jot down any half-baked thought that occurs to you and you can expand upon it later, when you have actually given it some thought. This is something you can already do in any other blogging platform, but the difference is there is no implicit expectation from the software that this will become a full fledged post. Which in turn allows you to write about stuff you probably would not have written before. It's a mental thing, and I'm afraid I can't really explain it better.