My manager asked me to research one of these: http://www.leadsexplorer.com
I don't know a lot about them. It did concern me though that it could be a privacy issue. It says you can email or phone call people after it's collected the company name and info. However, after having done some email marketing, the only recommended way to contact someone is if they are an existing customer or have given you permission to contact them.
Has anyone had any experience with this service or others like it? Or, what are some opinions on using services like this?
We'd be very careful with using that kind of data for email marketing. Like you mention, you're obviously not allowed to use Campaign Monitor to email anyone who isn't a customer and hasn't given you permission.
You'd also want to think about the kind of impression you're giving people by sending them unsolicited emails, and of course the relevant laws in your country.