The shares of Nvidia (NVDA) have been tearing up the charts in 2011, thanks to a lucrative settlement with Intel (INTC) and a high-profile new partnership with ARM Holdings (ARMH). The month of January isn't quite half-over yet, but the stock is already sitting on a year-to-date gain of 51.6%.

Judging by at least one headline hitting the wires, the stock's rapid rise is making some analysts nervous. However, on Wednesday, one upbeat options trader placed a bet on additional upside from NVDA during the near term.

There's been no shortage of new highs on the New York Stock Exchange lately -- but the thing is, very few of those new highs have been actual common stocks. Instead, a glut of preferred stocks and various fixed-income securities have been artificially inflating the annual-high figures on the Big Board.

Against this backdrop, it's even more impressive that Silver Wheaton (SLW) tapped the latest in a string of new annual highs today. The stock cruised up to $22.84 earlier, marking an all-time peak for the U.S.-traded shares of the Canadian commodity concern.

On Thursday, the shares of Crocs, Inc. (CROX) shuffled to a new 52-week high for the second time in as many sessions. The equity topped out at $8.47 on an intraday basis, marking its best price since July 2008. But with the stock hovering near a 20-month peak, can the shares continue to climb -- or are they due for a pullback?

If today's drop of more than 2% is any indication, it seems that CROX's positive momentum is cooling. The stock's Relative Strength Index (RSI) stands at 63, not far from overbought territory, so this modest retreat isn't terribly surprising.