I can testify that the essays by Moses LemuelRaj are a real blessing, as are many of the essays and studys on the old carmudgeon's site
I have many printed off and on my bookshelf.
http://www.thywordistruthkjv.com
The main page of
Brandons site is also a great source of information and
swordsearcher is simply the best bible study software there is ....period! and it contains as Tim mentioned some books on the manuscript evidence.