Sphere is a new search engine. It does things differently from other fellows like Feedster, Technorati and IceRocket. Relevance is based on links in/out of blog, meta data of the blog (length of posts, post frequency etc). I can't say this is better because I don't see why post frequency has anything to do with relevance unless the contents are relevant. Use this blog as example I have almost daily entry of del.icio.us links. I'm not alone having this.
As a test I entered "my emba" in the search box. This site, surprisingly, came first in the result list. Nobody out there blogging about EMBA? For more inside stuff TechCrunch has more here.
Below shows the profile and quick facts about this blog.