From the Reverbnation blog:

We've pulled in some best practices from our partner, Audiolife, listened to some creative suggestions from our users, and even looked at some of the early data from the Reverb Store to come up with some key concepts and a Top 5 list.

Key Concept:  Items that sell the best are...

• Relevant (speaks to a particular segment of your fans)
• Exclusive (gives fans a sense of 'rarity' around the product)
• Limited (gives the fan a reason to buy it now)

Think about these attributes when creating a product. Is it something my fans can relate to? Is it something that will be special to them? Be creative.

Click here to read the entire post.

The Sticker Guy has been making punk rock stickers for almost fifteen
years. Here he explains how to design the best vinyl stickers
including an introduction to the printing terms you might encounter
when finding a sticker vendor. Digital printing offers a wider variety
of colors and higher resolution printing, but nothing is quite as
weatherproof as printed vinyl.

http://www.stickerguy.com/questions.htm

Promotional tools and merchandise are two important – and often underappreciated – marketing elements that gigging artists on all levels should consider employing.

http://www.discmakers.com/music/ffwd/2005/merch.asp  

Once you've got the goods to sell, here are some tips on running an
organized merch table by Bob Baker.

http://www.bob-baker.com/musicpromotionblog/2005/07/top-cd-merch-sales-tips.html