FreshDV posted a note on Add Anamorphic Lens Flares to Video, an After Effects tutorial by Next Wave DV. Host Tony Reale uses flares from Video Copilot Optical Flares to show how and why to use flares:
"This is a great alternative to spending thousands of dollars on anamorphic lenses for your camera. The results are very realistic and highly customizable. I also show you how to add realistic handheld camera shake to your footage. This can be very important when working with DSLR footage since most DSLRs have rolling shutter problems that create a “jello-cam” effect when moved quickly."
Note: for more on lens flares, see Breath life into stale Lens Flares if you don't have a good lens flare filter and Real world lens flare tests for tests of flares from actual lenses.