Affiliates That Make Money

I am looking for advice about which affiliate programs actually produce revenue and how best to display ads

What kind of affiliate ads work - Text Link ads or buttons or banners.

I have signed up with several affiliate programs Linkshare - Commission Junction - Share-a- Sale. Do you have other affiliate programs to suggest?

What is the best strategy- place buttons and banners on all pages of a website or product links on pages with a topic relevant to the product.

Have you attended Affiliate Conferences? Has it helped your bottom line?

What is a reasonable commission per cent age?

Are affiliates who provide money for leads better than those who provide commissions on sales?