I run a business related to SEO, and we sit at number 1 for all our target keywords, yet we still get them.
'I was looking at your site, and its very good, but we can help you rank better in Google' yeah, right, of course you can.......
Also get the ones where they offer monthly services, and list exactly what they will do each month.
And then the ones from the web designers......
And then the photo retouchers contacting the photography sites......
And the domain ones me offering similar domains.........
And lets not forget the viagra ones.......