I discovered an excellent article listing some of the little-known features, disabled by default, that phpMyAdmin has. Check it out:

http://blog.ht4.ca/2009/12/29/hidden-phpmyadmin-features/

Some of the more useful ones include the Query History and Query Bookmarking. There is also a Designer Mode which lets you see the relations amongst your tables and more. I wish I had known about these, oh, 8 years ago!