Tono,

I have developed a very short multiple choice evaluation form that I ask people who hire me (usually after the first gig) to fill out when they have the time. Tell them that information gathered from this form will help you improve and develop the best possible entertainment for them and future audiences. Also ask for their permission to use their comments on your website and possibly in future publications. I do something similar as to what rharv explained above except I place them on a "Reviews" page on my website highlighted below my signature below.

Don't forget about canvassing venues in which you are interesting in performing. Find out the person who books the talent, make an appointment and drop in with a CD and some "press" gathered via the good advice offered above. And as Mac says don't forget the retirement facilities.

Later,