I was shown the coolness of Google Trends a while ago on a posting over at Sociological Images (Weekends Are for Porn).
Well, if you do a search on Google Trends for "ipod", you get the following graph:
Apparently, ipods are only really of interest as a Christmas gift item... What's interesting is that for some reason (whether it was because of market saturation, the iphone or the economy), the number of searches for "ipod" declined in December 2008 from the apparently consistent highs of 2005, 2006, and 2007. Furthermore, the number of searches in December of 2009 was even lower than that of 2008.
What about New Year's resolutions, though? If you do a search for "yoga, weight loss, pilates, exercise" you get the following:
A definite uptick just in the last throes of the year, tailing off (with remarkable consistency) sometime toward the end of each year. If you do a search for "diet", you will see a very similar trend. However, the values for 2004 were anomalous. It was -- if memory serves -- at this time when there was increased backlash against the Atkins and the South Beach diets (both high-protein, low-carb diets). I think that this was possibly the reason why the values for "diet" in 2004 were so different than in all the other years. More New Years resolution-type search trends can be seen if you look for "fitness, gym, YMCA". I would show the picture, but it looks pretty similar to the one above.