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I think you’re restricting your scope by reviewing books which actually exist – why not take a Borgesian leap and review books which don’t? If you got a lot of enquiries about a particular fictitious book… write it.
Demand paging, as it were.

I have another idea: this title would make a perfect fake book jacket. (google for some nice examples). Sell it in your online store. Secretly unload it in bookstores near the motivational section area, hijacking some unsuspecting book to carry your viral marketing.

And even that book, brilliant as it is, did not make me a considerably better problem solver. Probably this is true of any self-improvement book. The only difference may be that unlike in the case of books which claim to improve something that cannot be measured or even defined clearly, one’s math problem-solving ability can be measured fairly accurately and repeatably.

It would be nice if there is a study on the expected average improvement in one’s “self” upon reading a really good self-improvement book

Among your list, I’ve read (rather, skimmed thru) GTD and I agree with you: although I’m too lazy to actually use it, it made a lot of sense (my fav is the one where he says if it takes less than 5 min, do it now: it is simple to follow, has a good rationale — it will take more time to plan it than to do it — and it actually works). There is this GTD wiki which I meant to try, but never did.

Another good book I’ve read is Good to Great, or Built to Last; it’s the same author but I dont remember which is which. It’s the one in which he talks about great bosses, and the difference between level 4 and level 5 leaders, which is really interesting.

Re 7 habits, I remember everyone in India seemed to have it. I’ve never been able to read it!