This is most likely because I'm pregnant and I hear this is very common in the first trimester especially. See, I knew what I was doing when I started knitting baby clothes two years ago despite knowing we weren't ready to start a family then ;-)
I've just given up and unjoined the 2009 stash down and Hat of the Month groups on Ravelry. It isn't happening.
I really would like this to change soon. To try and spur that, despite the lack of knitting my existing stash in the last couple months, I went to the Great Lakes Fiber Show today and bought six skeins of yarn.
I have even managed to enter this new stash (with pictures!) into Ravelry already. As best as I can anyhow, some of this yarn didn't come with labels and the receipts don't have any store info on and I don't remember the names of the booths.