CAPTCHAs are an interesting example of software that actually gets worse the more people are using it. Making fun and unique CAPTCHAs for large sites might be a

CAPTCHAs are an interesting example of software that actually gets worse the more people are using it. Making fun and unique CAPTCHAs for large sites might be a good business for programmers that aren't interested in the winner-take-all pressures of normal software.