I celebrate it in the loosest sense of the word. Having worked in retail for quite some time and witnessing peoples' reactions towards things they want vs. things they are getting for others, the holiday is more wrought with greed, ego, and the shadiest sectors of the human soul rather than a feeling of giving. And my celebration is focused more towards the first week of January, when most people are done returning the stuff they don't want - only to bitch because what they do want has been sold out for several weeks.
My personal celebration is focused more towards seeing people and family I usually do not get to see - though I actually spend quite a bit of time with those I am close with a lot more often.