Mark Cuban posts his (biased) review of Google Blog Search and explains how IceRocket can out-manoeuvre the giant.
Google is fast. But it becomes very slow when you have to go to jump between their front page advanced search page in order to date delimit your search.
Google doesnt support Topics/Tags. Which means that when you do a search for a keyword and it returns 3k results today, well that same search might return 33k results next year at this time. Google has some nice search delimiters, but self inclusion in a topic by the author is probably the best.