urls-that-humans-and-search-engines appreciate

Two reasons to use Friendly URLs
 

Virality

It is important that people can talk your URLs where ever possible. You saw a web article you like to recommend, to someone, think: What  kind of urls of these two is easy to remember and a say?
 

Optimization

Search engines like clean URLs. And we also know how important good search engine rankings are. Optimization of a web site (or its URLs) is more than just for SEO purposes. Many social bookmarking sites  only let you save the URL and a description. It is nice that the description were a part of the URL