Google recently launched the Google Blogsearch. A first I thought this was a typically good Google product: fast, up-to-date and reliable. Then some spam started to appear in their index and it became rapidly less useful.
Now it is approaching uselessness for searches ordered by date (and what other kind of search would you want for a blog search anyway?)
For instance, compare this search for email howto mac on Google Blogsearch, IceRocket, Feedster, Blogdigger and Technorati.
Right now 7 out of the first 10 results on Google are obvious spam, with no pretence of being anything else. IceRocket and Feedster have a couple of spam items on their first page, while Blogdigger and Technorati seem to have results that at least look spam free. Those results actually makes Google look better than it actually is: it looks like roughly 40 out of the first 50 items Google are showing are spam, and all come from the the same couple of sites.
I aren't normally one to criticize Google; I think that the Google search engine itself is a lot better than the competition. I have to wonder, though: with all those highly qualified PhD's why is that they can't detect that a site called 1001-the-most-complete-broadband.info which contains nothing but alphabetically ordered lists of linked keywords is a spam blog?