The main point about Diver (that helps set the right expectations) is that it is a tool on top of search engines. Diver doesn't search; what it does is - it very quickly and efficiently processes your search results.
It doesn't have its own syntax; the syntax to be used on Google is Google's etc.
To use Diver one needs to be good at Boolean search. Strings that I use with Diver are somewhat different than the strings I use if I manually collect results, at least in one aspect: it's OK getting several hundred results (many more than "usual") because the collection of the info is automated.
I'll add more to this later and will try to address your other questions.
I wrote an article that has examples of searches a while ago and it's here: http://thetalentbuzz.com/2008/08/i-disagree-with-donato-diorio/
It would be interesting to hear how others use Diver.
Is there any fee involved with the diver.
I use contact capture though sometimes, but I guess there is a annual fee for the Diver product.
Have you used eGrabber products such as ResumeFinder, ResumeGrabber and now LeadResearcher.
These products come with all boolean strings you need to grab resumes/profiles and conduct Internet research on candidates.
For example, with LinkedIn or other profiles, you get name/company/title but no contact details.
LeadResearcher can help you get missing contact details such email, phone etc.
also gets you email IDs of other people in the company if they are on the Internet.
Free trial versions are available at www.egrabber.com
Call us if you want a demo 408-705-1106