I have heard it said for years that "The Money is in the List".  Building a good list of names and email addressses is one of the most important things you can do as an Internet Marketer.  Without a good list to offer your products to, everything else is just a waste of time.  Here is a list of list building sites that I have found very useful in building a list of prospects quickly.  The more list builders you use, the faster you will build a good quality list.  It has been said that a good list will make you about $1.00 per contact per month.

List Building Software

ListDotCom

List Explode

List Fire

The List Machine

The Thunder List

Triple Your List

Your Lucky List