Topix.net says they added the 15k "top weblogs" to their search results mixed in with mainstream news sources.
For example, a search for "Amazon Mechanical Turk" on Topix.net brings up articles from news sites and a few dozen blogs including my post.
It doesn't dive as deep as Technorati, Feedster, or Google Blog Search, but does give a good number of high quality results. I saw no spam in my search results for the examples I tried, something that is a serious problem on those other blog search engines.
Rich did say that the 15k blogs are just a start and that they hope to expand their coverage up to 1M weblogs. It'll be interesting to see if they can maintain their spammy-free goodness as they broaden their coverage.
Speaking of spam, Rich said:
What we're seeing is that 85-90% of the daily posts hitting ping services such as weblogs.com are spam (take a look for yourself). Of well-ranked non-spam blogs that we've discovered, we've found about half haven't been updated in the past 60 days. Our filters sift through what's left, which even after discarding 95%, is still a great deal of good material.Lots of crap out there, isn't there?
For more on blog spam, see my earlier post, "How many feeds matter?", where I said that, based on Findory's experience and data from Bloglines, 95% or more of the supposed 20M+ weblogs out there appear to be fake, not useful, or spam.