Two newer blog search engines your readers may want to check out are Sphere (www.sphere.com) and Blogdimension (www.blogdimension).

Or, to make things simple, your readers could try the blog search capability at Zuula . It provides easy access to blog search results from eight different leading blog search engines — including many of the blog search engines you've listed above.

Zuula also is a useful resource for general web search. I may be somewhat biased on this subject, though, since I'm one of Zuula's founders …