First of all Mike just want to say keep it up. Love this place. Only just started to read the posts here.
Anyway.
I recently started experimenting with Adswaps.
An Adswap is when two marketers agree to promote each others free product.
This usually happens when you have a free offer, in the form of an E-book/Report or a DVD Course.
The best place to do Adswaps is places like the Warrior Forum and also my personal favorite safe-swaps.com (no affiliation).
You can not only boost your list overnight but you can also test the market. Once you have created your list make sure you build a relationship with that list.
For example, if I have set up a squeeze page for a free, kick ass product and I have 450 opt ins as a result of Adswaps...and traffic to my squeeze page...I need to make sure I build a relationship with this new list.
You can do this by interacting with them. Use Surveymonkey.com to interview your list to see what kind of products they are looking for.
Believe it or not Adswaps people have built a list from 100+ to 30k in a space of 12 months, thanks to Adswaps.
Enjoy