I recently found while roll searching a 2003 cent with a double die reverse. It is now listed as WDDR_032 by John Wexler. That would be my first new dd find. I also found a Polk dollar with a dropped letter (T) on the edge next to the P mm. Certified by Ken Potter and Mike Diamond.
I've only been collecting errors for just over a year and consider myself very lucky and am loving the education it provides.