Yes, there are many projects using DNA for genealogical purposes. Google the name and "DNA Project." DNA can be used to connect you to family groups, but it won't tell you who your immediate relatives are, unless the DNA information for those relatives is in the database. You can connect with other people (whose DNA is in the database) who share your DNA, but it won't tell you exactly how you are related.

Personally, I would not send a DNA sample unless you are positive that your privacy will be protected and that the sample will not be tested for anything other than genealogical matching without your expressed permission. I would also want assurances that your information will deleted from the database if you request that it be removed.

I am currently trying to read a book on DNA testing for genealogical purpose, but it is the season for gardening and some painting that my wife wants finished before expected guests arrive. I might finish the book by Christmas if we have an early fall.