Goodness, where do I start...
1. A whet tumbler using stainless media. Similar to the famous Fog Ducker's model, but smaller, handling about 400 9mm cases.
2. Poor man's OAL gauge. I built it based on descriptions I found elsewhere, so its not my invention.:
3. I put this 50 CD case through the side whole upside-down on my Lee FCD installed in a single-stage press. This setup is my bulge buster, I collect about 200 .40S&W cases then empty the CD case:
4. My spent primer collector. Not much of an invention, but keeping the bottle closed makes me breathe less sh*t from spent primers:
5. Two in one shot: A ghetto bullet tray. Does the job for a fraction of the cost (look at ultimatereloader's tray & you'll see my point). Also a LED flip-light from Costco, hanging on the expander die. I found this gives me the best chance to spot a squib load:
6. A counter. A saw others doing the mechanical version, so I thought it would be cool to make an electric one, from all the copier spare parts I have lying around. I don't really need one, I just had an urge to make it.
7. And, last but not least, my latest improvement to LnL pickup tubes: a tube mounted to Lee AutoPrime tray, with a 'vibrator' from a cell phone and a small switch. Loading the tubes has become fun!

Don't let the small allen keys scare you, these are to center the tube so I don't have to mess with epoxy.
I am currently trying to make a motorized slide, to mimic the LnL case loader's shuttle. I'm also making a bullet collator so I don't have to spend $250 on Hornady's.