This SodaStream thing looks pretty fun to me.
I like sparkling water a lot, especially mixed with juice. I don't know how cost-effective this thing really would be, but making your own sparkling water (and homemade soda) at home any time you want would be cool, I think.
So, you know. . . if you're looking to spend $100, more or less, on me this Christmas (haha), here is one idea for ya. ;)
(really, though, I'm just hardpressed for a blog post. NaBloPoMo is killing me this year. I'm just struggling with it. Struggling with wanting to blog at all lately, actually. Oh well. More later.)