I've watched a couple of videos so far. Well done, sir. I have a few suggestions, some of which have been mentioned already:
1) I would suggest switching to a non-rotating chair. You sway back and forth and rotate quite a bit and it's a bit distracting.
2) You have a big, loose thread on the bill of your hat
3) Definitely look into Adobe Premier or other software to allow you to drop in scans instead of holding cards up to the camera. The quality would be improved dramatically by doing so.
4) You could use a little light from behind the camera as you are just a hair darker than you maybe should be.
Some other positives:
1) It doesn't look like you're using a microphone but your audio is very, very good. Clear and loud. Nice!
2) Kudos on the beautiful EFF Monarchs jersey. EFF does such nice work. If you haven't been there, visiting their store in Seattle is a real treat. I have their NY Knights (from "The Natural") jersey and it's terrific.
Keep up the good work!