http://www.livejournal.com/users/helloyarn/2165.html?view=10357#t10357 (7th April 2004) First specific reference to this specific meme (no meme name given although it transpires that in fact is a variant on a previous similar meme, see below).

http://www.livejournal.com/users/batyatoon/14039.html (8th April 2004) first ref: meme given Bibliomeme name

http://www.foldedspace.org/archives/002338.html (12th April 2004) first ref: Book Meme (mutates name from Bibliomeme to Book Meme)

http://www.livejournal.com/users/the_nita/37386.html (12th April 2004) first ref to Page 23 Meme (mutates name from Bibliomeme or Book Meme)

http://www.sixdifferentways.com/archives/006659.html (13th April 2004) ref: Book Meme

http://robert.williamsonline.us/archives/000666.html (15th April 2004) ref: Book Meme

http://thinklings.org/jared/index.php?p=363&more=1&c=1 (15th April 2004) ref: Book Meme

http://www.freakinjen.us/comments.php?id=P1473_0_1_0 (15th April 2004) ref: Book Meme

http://www.thegreatseparation.com/newsfront/2004/04/book_meme.html (16th April 2004) ref: Book Meme

http://blogs.salon.com/0001092/2004/04/16.html (16th April 2004) ref: Book Meme

http://www.livejournal.com/users/nhw/93038.html (17th April) ref: Bibliomeme

http://weblogs.asp.net/philoj/archive/2004/04/17/115354.aspx (17th April) ref: Bibliomeme

http://weblogs.asp.net/alexbarn/archive/2004/04/18/115586.aspx (18th April 2004) ref: Bibliomeme

http://lange.livejournal.com/68243.html (18th April 2004) ref: Bibliomeme

http://www.chattablogs.com/hawbaker/archives/012391.html (19th April 2004) ref: Book Meme

http://www.kathrynpetro.com/mindfullife/archives/000357.html (19th April 2004) ref: Book Meme

http://www.vurt.co.uk/archives/p/144/c/1 (20th April 2004) ref: Bibliomeme

http://66.108.215.204:8001/blog/archive/2004/04/20/244.aspx (20th April 2004) ref: Bibliomeme

http://www.insultsunpunished.com/archives/2004/04/21/book-meme-continued/ (21st April 2004) ref: Book Meme

http://fridsma.covblogs.com/archives/001928.html (21st April 2004)ref: Book Meme

http://amish.blogmosis.com/archives/024470.html (22th April 2004) ref: Book Meme

http://nick.typepad.com/blog/2004/04/book_meme.html (26th April 2004) (Nick Bradbury, developer of FeedDemon)  ref: Book Meme (about 556 appear in Google referring to this entry by Nick)

http://utterlyboring.com/archives/2004/04/26/that_annoying_book_meme.php (26th April 2004) ref: Book Meme

http://www.simiandesign.com/blog-fu/2004/04/002064.cfm (26th April 2004) ref: Book Meme

http://www.webfroot.co.nz/?p=1053&c=1 (26th April 2004) ref: Book Meme

http://blog.outer-court.com/archive/2004_04_27_index.html (26th April 2004) ref: Book Meme (mutates to CD Meme)

http://www.burtonini.com/blog/life/book-meme-20040503 (5th May 2004) ref: Book Meme

There are now 11,000 returns on Google for the exact phrase "Book meme",  41 for "Bibliomeme", 1,450 for "Page 23 meme".

Just before posting this I found a comprehensive research piece on this meme,page 23, sentence 5: an autopsy .  It turns out that

"that p23s5 was a mutation of an earlier meme, p18s4. While waiting to hear back from AC, I realized that I had been exposed much earlier to this less virulent variation, by hepkitten on April 4th."