The off season is a great time to think about how you can get faster for the next bike/triathlon season. A lot of us will do weights to strengthen parts of our bodies that have been neglected, or we work on improving our weakness.
Or, another way to get faster is to spend money - like getting a new bike, fast race wheels, a power meter to train with more focus, the latest wind tunnel tested aerobar, etc...
At the end of last summer and purchased a HED Jet Disc wheel and gave my impressions on it.  (see http://www.freetrainingplan.com/community/node/21).
I'm considering getting a nice all purpose fast race wheelset like the Zipp 404's. Doing a bit of research I found the American Classic Carbon 58 clincher, which is a 404 rim with very smooth American Classic hubs. At a fraction of the cost Zipp 404's! I  contacted Mark Kouri again at Peleton Cycles and was yet again very surpised by the great prices.
Mark can get very good prices on Zipp wheels, American Classic's, frames, power meters, and many other parts. If your looking for something, give him call, and tell him you heard about his shop from Michel @ Freetrainingplan.com. He'll quote you a great price.