A useful post from the blog At Last! Writer Beware Blogs! A.C. Crispin and Victoria Strauss Reveal All! on Evaluating an Agent’s Website
It’s good advice, but there is something more fundamental. Target an agent, not from the website, but according to their client list (and if an agent won’t release their client list, be suspicious.)
For most of us, it’s not a question of who makes the most sales, but who represents books like the one we’re offering. But not too alike – I was once told taking my book on would lead to a conflict of interest, because my novel was too similar to one already being represented.