I'm a big fan of Tomy Pocket Games. These were small, pocket sized, mechanical games that used to be sold for around $2-$3 from the mid 70's until the 90's. They've also been produced under other names later on, like Milton Bradley Pocketfuls, and were known as Pocketeers in Europe & Pocketmates in Japan.
I used to post my reviews of them in my Toys & More thread, but from now on, I'm going to post them here.
If you have any memories or favorites, you can post them here too.