I heard creatine retains water in your system, and therefore you look "puffy", which is good, cause it makes you look bigger.
I don't know how after one day it could have any effect, though.
On a side note, I just got my CELL-TECH creatine yesterday in the mail. I shouldn't have gotten it. (75grams sugar per serving, and overpriced...) And blech, that stuff is nasty going down.
Oh, another side note: i heard you aren't supposed to drink your creatine and glutamine at the same time. I guess they go after the same receptors, so you don't get the full effect of each. I used to mix them in the same glass...