Object-Oriented (OO) development is by far the most popular in the development arena today, however, object-oriented databases are not. Relational databases still rule the roost, however, this causes some headache for OO developers.
A concept that many of the major database vendors have come up with is a hybrid database that integrates the concepts of both OO and Relational databases.
What can you tell me about hybrid databases? What are the positives and negatives? Are they better than using a OO or Relational database specifically? (Research will be necessary and do not rely solely on Wikipedia)