Tip of the Week: Have email.
Yes, this sounds simple and obvious, but there are people out there who don't have email. Of course, they are probably not reading this. So, go tell them to get email. Then, make sure your email is on everything: cover letter, query, first page of the manuscript, etc. Email is the major form of communication these days. Although my boss at BTP will still phone people to tell them of our interest, I do not. I email. And I only email.