Bold for stuff you’ve done, italics for stuff you plan to do one day, and normal for stuff you’re not planning on doing.

Afghan
I-cord
Garter stitch
Knitting with metal wire
Shawl
Stockinette stitch
Socks: top-down
Socks: toe-up
Knitting with camel yarn
Mittens: Cuff-up
Mittens: Tip-down
Hat
Knitting with silk
Moebius band knitting
Participating in a KAL
Sweater
Drop stitch patterns
Knitting with recycled/secondhand yarn
Slip stitch patterns
Knitting with bananafiber yarn
Domino knitting (=modular knitting)
Twisted stitch patterns
Knitting with bamboo yarn
Two end knitting
Charity knitting
Knitting with soy yarn
Cardigan
Toy/doll clothing
Knitting with circular needles
Baby items
Knitting with your own handspun yarn
Slippers
Graffitti knitting (knitting items on, or to be left on the street)
Continental knitting
Designing knitted garments
Cable stitch patterns (incl. Aran)
Lace patterns
Publishing a knitting book
Scarf
Teaching a child to knit
American/English knitting (as opposed to continental)
Knitting to make money
Button holes
Knitting with alpaca
Fair Isle knitting
Norwegian knitting
Dying with plant colours
Knitting items for a wedding
Household items (dishcloths, washcloths, tea cosies…)
Knitting socks (or other small tubular items) on two circulars
Olympic knitting
Knitting with someone elses handspun yarn
Knitting with dpns
Holiday related knitting
Teaching a male how to knit
Bobbles
Knitting for a living
Knitting with cotton
Knitting smocking
Dying yarn
Steeks
Knitting art
Knitting two socks (or other small tubular items) on two circulars simultaneously
Fulling/felting
Knitting with wool
Textured knitting
Kitchener BO
Purses/bags
Knitting with beads
Swatching
Long Tail CO
Entrelac Knitting and purling backwards
Machine knitting
Knitting with selfpatterning/selfstriping/variegating yarn
Stuffed toys 
Knitting with cashmere
Darning
Jewelry
Knitting with synthetic yarn
Writing a pattern
Gloves
Intarsia
Knitting with linen
Knitting for preemies
Tubular CO
Freeform knitting
Short rows
Cuffs/fingerless mitts/armwarmers
Pillows
Knitting a pattern from an online knitting magazine
Rug
Knitting on a loom
Thrummed knitting
Knitting a gift
Knitting for pets
Shrug/bolero/poncho
Knitting with dog/cat hair
Hair accessories
Knitting in public

It’s going around.  Do it if you want.