Sudoku While I've played (on paper and computer) most types, my favorite is killer sudoku. I keep trying to beat my own top score
Romantic Mystery or romantic suspense novels I picked up this hobby five years ago, when I raided my mom's library.
Mythology I buy DVDs, books, scour the web for all the different world mythologies and try compare & contrast them. It's amazing how many common elements they have. My favorites are Greek and Hindu mythology.
Collecting I collect keychains (70+), metallic & hand-crafted bookmarks(30+), and magnets(150+).