I've talked before about how useful blogs/wikis are in managing a team or small business because they serve as a central information point to stop endless emails. Publi.sh offers a (faster/easier?) alternative to a blog for sharing information that's only relevant for short periods of time, without the hassle of culling old posts.
Publi.sh helps you create 'disposible feeds for personal and group use' that can be read through any RSS reader (like netvibes, Bloglines etc) and added to by sending in an email, or using a bookmark link.
The major benefit in using Publi.sh over a blog for time-based information sharing is it's disposible nature (if no one accesses a feed for 14 days it's wiped, so you don't end up with mountains of useless information). It's super simple, feature poor (no comments, archives etc) and performs the function of sharing information quickly and easily, without the hassle of having to manage archives and delete out-of-date information (you can only access the last 15 posts, all older ones are deleted).
Publi.sh obviously has a very specific use, but if you have that specific need, it could be just what you're after.