Are you working in After Effects? Check out Video Copilot

Video Copilot is an After Effects haven with lots of great ideas and plenty of free tutorials for both special effects and motion graphics. You can download the source files and follow along, or use them as stock footage and make your own changes. They also have a lot of great products for sale, such as pre-matted explosions that you can just drop on top of your existing footage. Overall it’s a comprehensive site advanced enough for the seasoned pro, but accessible enough for the novice.