In my spare time, I peruse other people's want lists. I like to see if there are any sets I can help finish, or if there are any interesting collections. Of course, my eyes gravitate to anything I come across that says "Cleveland" or "Indians." So when I came across someone who collects Brett Butler cards (no, not the comedienne - the ex-Giant/Indian/Dodger) who had posted on the Collector's Universe message boards regarding '09 Heritage, I was curious.
This collector's site is a wealth of information and pictures of cards, from 1930 Goudeys to 2008 Goudeys. I learned that some of those cards that I have without printed backs are actually Proofs and not errors. Great stuff. Good job, Mr. Larry Tipton.
There is also his personal grading guide. It is well worth the read.