I (always) have several knitting projects going at one time. There's usually a portable one (socks!), something challenging and fun, and something more mindless but still fun.
Right now I'm working on a pair of socks with a fun lace pattern (Ginkgo Sock Pattern free here).
A baby sweater (Clemmie's Sweater pattern free here).
I have a sweater for myself that I started late last winter that is just about 3/4 of the way done. I just haven't picked it up in awhile, and that often makes going back to it harder because I can't just pick it up and knit, I have to figure out where I was when I stopped first.
I have tons of other projects that I want to do...but am quickly running out of time before school starts again!