> This is where you hire a copywriter for your website and he or she fills the pages with cleverly crafted, delightfully delectable prose that oh-so-playfully sing and dance.<p>Prose is singular. The plural of prose is proses, though it's not frequently used. If you're going to chide authors on style, make sure you've got the grammar correct first. Also as a counterexample, I'd like to point out that woot.com typically exhibits playful prose to great effect. Honestly, I probably visit more for the excellent ad copy than any other reason.
They don't take their own advice; their homepage is so busy!<p><a href="http://www.webcopyplus.com/index.html" rel="nofollow">http://www.webcopyplus.com/index.html</a>
I'd like to add that good editing can make or break the copy, no matter who it's targeted at.<p>Their != they're != there
Your != you're
Then != than
Of != have