This link building tactic may not be relevant to you, but if you are
promoting an ebook why not list that ebook with the ebook directories?
Not only will you get backlinks, but you'll generate more traffic.
Ebook Directories:
bizzydays.com
ebook2u.com
ebook88.com
ebookbroadcast.com
e-bookdirectory.com
ebookdirectory.com
ebookgallery.com
ebookgiveaways.com
ebookheaven.co.uk
ebookjungle.com
ebookleads.com
ebookmall.com
ebookpalace.com
ebooks4free.net
ebookslibrary.com
ebooktags.com
ebooktemplatesource.com
e-book-zone.com
ecourseweb.com
ecourseweb.com
e-library.net
freeebookdirectory.com
free-ebooks.net
free-ebooksonline.com
getfreeebooks.com
jogena.com
mindlikewater.com
mushroom-ebooks.com
powerbusinesspublishing.com
published.com
scribd.com
sharewareebooks.com
viralmarketinginabox.com
virtual-ebooks.com
websuccesscentral.com
wisdomebooks.com
witguides.com
You can submit your PDFs to ...
ButterflyReports
Calameo
DocStoc
eSnips
FreeIQ
Issuu
Scribd
Yudu
(1) The jury is still out about whether there is added value in getting backlinks from sites in your niche (not talking about getting pass-through traffic, just the backlink value). Many many people feel this is way overrated, me being one of them.
(2) With respect to "do follow", it certainly has a value by google, but really no effect as to yahoo, etc.
(3) You briefly mentioned this sort of thing in the "hitch a ride" section, but IMHO the best and easiest way to get great quality backlinks is from putting links in your profile and forum and web 2.0 properties, where the underlying domain has a high PR. Many of us have had phenomenal success with this linkjuice.
(4) Not everyone agrees as to how much of an issue it is to get tons of backlinks quickly. Many believe that the whole Google sandbox thing is way overrated. If we are talking thousands and thousands to a new domain, then OK. but I don't think throwing a hundred of backlinks at a EZA article a day is going to do anything but help you get to the top of google.