It couldn't be easier to find an email address for a publisher and send off your comments about typos and/or formatting errors in a title they released. I've done it myself on occasion (only for egregious cases -- because like Hitch, I believe ebooks tend to be judged way more harshly than their print counterparts ever would have been). In each case, I sent off the email (CCing the author thinking they may know better who to direct the complaint to) and then promptly forgot about it. Because my part as the reader /consumer
was done.
I think a big part of the problem with this sort of thing is that those readers "reporting" the typos/formatting don't seem to understand their role in this particular show. They seem to want some sort of feedback from someone--to
know they made a difference. It's not enough to let the publisher know; they want
everyone to know that they let the publisher know. You know?
I'm not suggesting cybmole suffers from that particular affliction or anything, just an observation.
The pat on the back isn't going to come. The online, crowd-sourced, proof-reading, instant-revision-resulting engine isn't going to happen. Not for already (traditionally) published, revenue-generating books, anyway.
So fix it for yourself, if you like, and jot an email to the publisher and/or author, if you feel so compelled, and move on. Whether it's effective or not isn't all that relevant, really.