We receive a lot of requests from random strangers asking for a link back. Every link on this page is here because one of us or both have had some interaction with its owner: either we love this person's books, or they posted a review of our work, or they host an informative blog we read. Linking back qualifies as endorsement and neither one of us will endorse something we're not familiar with.
If you're interested in the business of publishing and submitting our work, I recommend first visiting Writer Beware. It contains a wealth of helpful information and it will help you avoid some common pitfalls.
If you're interested in how agents think, these are good places to visit: