By splitting my blog and moving custom domain to the server with more functionality I messed up page listing on Google. Probably with time this will fix itself.

The essence is that the following sample paths to one post ere different on both blogs.

2007/12/splitting-blog.html
2007/12/07/splitting-blog/

There is a way to make the second path the same as first, but it eliminates the grouping of posts per day. The effect would be - no two posts in a month could have the same title.