Well, it's done.
After letting my hair for at least 18 months (as far as I can tell I haven't had it cut since at least September of 2006), I finally had Heather do the honors of cutting it for donation to Locks of Love.
So now I hope to grow it out again - so I'll be posting photos of the growth this time. I'll use my webcam so it'll be easier to get the shots to look the same.