I started my list building efforts from January, 08 and by now i have list of over 2500 double opt in members.
My fist list building process was started using ebay. I simply use those $0.01 auctions to build my list (And yes, it really worked), unfortunately ebay banned the selling of digital products and this broke my continuous flow of '20-30' leads per day. Even today i manage to get 30-40 targeted leads everyday using the power of Mike's ListDotCom. Initially, i never believed in this list building process as i was those, looking for 'Make $1000 everyday' scams, later this year i understood the importance of list. i read some where 'Money is in the List' and now i really understood the meaning of this priceless phrase. From my experience i can say that you will get those 'dis-hearten' moments in your list building efforts but if you overcome it and continued your 'List Building' offer, you will really enjoy long lasting income
Sorry for 'errors' as my native language is not English