Oh goody, I get to complain about this one now.

My thing is, I thought this was a BRILLIANT Hunt, had it been a book that was unrelated to LOST. If it had been "Tale of Two Cities", for instance, many of us would have paused and said, well, there's got to be more. This Hunt became more of a luck issue... and did favor the cautious. Which is not to take anything away from those who got it.. kudos to them!
Being one of the 20, here's what I thought:
First, I looked at the first numbers as dates/times (the ones that ended up being book/ch/word). I was wrong to write this off as anything else so soon, because at least two of the sets came VERY close to being 108 apart... so I thought, ok, that's not something we're supposed to look at. I went to the Investigations section and looked up the real screencaps of the Pearl printouts (both versions) and realized neither had the 0's and 1's.
I tried the binary code right away, and got "IBNISBN". WTH is that, I thought? I saw ISBN and thought it might be the book. Googled the other number, and came up with Our Mutual Friend. OK, definitely on to something, I thought. Went back, redid the binary code, realized I dropped a set, and got the ISBNISBN. With those two pointing in the same direction, I thought, this must be two easy, and wrung my hands for a few minutes, but figured if that was the answer, I'd just be wasting time, so submitted at 20 min.