Pebble Go by Capstone is a fun, graphic research database for PreK-2. Early World of Learning is also great for the little ones. The World Book Student has an entire section dedicated to the teaching of research.
We have two Spanish resources, Brainop Espanol and WorldBook Estudiantil Hallazgos. WorldBook Discover for Kids is great for the whole school.
Don't forget to enjoy the 210 Capstone Interactive Books and the Storybooks, Non Fiction, Chapter books, and videos in Tumblooks! Finally, if you want to meet an author, just head over to Teachingbooks.net! You can see various booktalks and learn how the authors came up with their ideas for their stories.