Wine Century Club
This is a neat organization that has a bunch of chapters around the US, Canada, and possibly some other countries, I'm not sure.
The idea behind the club is that to be a member, you need to have tried wines that were made from at least 100 different wine grapes. They provide a checklist and you can just tick them off as you try a wine using a new grape. What is neat is that by doing this, you automatically learn a lot more about wine grapes.
They also sell a 'periodic table of wine grapes' which I have framed in my kitchen.
You can start or join a local chapter and these groups get together for tastings. It's a fun, low maintenance way to be a wine junkie.