There already are so many blogs on search why another? (just check out the blogroll on searchengineland.com)
There are at least a couple of reasons.
Information Retrival (or IR) is not exactly search. It is search and more. Much more.
Semantics aside, there is a second and probably more important reason: none of all those blogs discuss the tech, at least not to the extend this blog is intended to do. They are more focussed on search marketing, search engine news etc. and often present the view of/for a marketer, webmaster or user.
I guess the purpose of this blog will be better justified by the posts to come than my scribblings. So I will leave it at this.