Twitter clones have been aplenty since the service launched in mid-2006. Many have come out offering more, foregoing some of the simplicity that made Twitter popular to begin with (see Poodz and Pownce). However, one that's just cropped up, called Adocu, is almost a joke, ditching the 160-character cap and only limiting messages to whatever you can fit inside of one (sometimes giant) word.
Users are encouraged to string multiple words together. You can fit nearly whatever you want as long as there are no spaces. OK, however, are dashes, apostrophes, commas, and periods--meaning you can add some order to your words if you'd like. My guess, though, is that the creators wanted to instill an even greater sense of minimalism to the point of removing whatever capitalization you throw into your messages.
It's unlikely that the niche of people willing to use Twitter right now want to ditch that community for Adocu's. There's currently no API, no way to search for friends, or any sort of mobile interface, which is very necessary with a service like this. One thing Adocu does have going for it is that it's fast and peppy, something Twitter has been struggling with lately.