Zac Johnson decided to use an incentive (a free MoneyReign T-Shirt) to generate more tips for his Top Spots list.. The Top Spots list is a “Fancy-Schmancy Tip Jar For Your Blog”, powered by Jim Kukral’s ScratchBack. For people that don’t want the headache of manually coding up their own Paypal Donations button, ScratchBack is a pretty easy alternative.

My only complaint with ScratchBack is that they’ve hardcoded all links with a nofollow tag, instead of giving users the option whether or not to use the nofollow tag on outgoing links..