URL’s are great… but people that use the default URL wordpress spits out, or try to stuff their urls lose human value, and thus some SEO value too. Google likes short URL’s – Matt Cutts of Google once said “Now, our algorithms typically will just weight those words less and just not give you as much credit.
“The thing to be aware of is, ask yourself: ‘How does this look to a regular user?’
3 Keys to Solid URL’s
Keep them readable (match to title most of the time, leave out dynamic stuff when possible like ? And #)
Use your keyword (often url becomes anchor text)
Keep it short (50-60 characters, no stop words)