There´s a great book on type and layout that I always recommend to eBay sellers. It´s called Type and Layout: Are You Communicating or Just Making Pretty Shapes. You may not think that you´re in the typography and design business when you start an eBay store or put up listings, but you´d be wrong. You´re in the communication business to some extent, and it´s important to recognize that how you say something is just as important as what you say.
By this, I mean that the fonts, colors and formatting you choose for your descriptions and product layouts are very important.
What follows are just a few tidbits from "Type and Layout." They based this on extensive reading research, where readers took surveys and comprehension tests after reading a variety of advertisements and copy blocks.
From the book:
38% of readers showed poor comprehension when reading layouts which forced the eye to fight against reading gravity. [My comment: generally, reading gravity has to do with how we look to the upper left to start reading, read from left to right, and read down the page; reading gravity is also affected by photos]
65% showed poor comprehension of articles set in sans serif body type.
45% showed poor comprehension of articles set ragged on the right, and 72% showed poor comprehension of articles set ragged on the left.
65% showed poor comprehension of text printed in bright process colors.
81% showed poor comprehension of text printed in bright process colors.
88% showed poor comprehension of articles printed in reverse [white or light text on black or dark background]
Keep these in mind when you´re developing eBay copy and listings. Just a few simple adjustments, and your descriptions will be much more readable to those passing through.