Auto parts company O'Reilly Automotive, Inc. (NASDAQ: ORLY- option chain) is one of the newest additions to the S&P 500 Index (SPX). Standard & Poor's announced late Thursday that ORLY will join the venerable index after the close of trading on March 26, where it will replace Noble Corp. (NYSE: NE).

The news caps off a pretty good week for ORLY; on Wednesday, Robert W. Baird initiated coverage of the stock with an "outperform" rating, and the equity tagged a new 52-week high of $36.17 in Thursday's session.

Just last week, Hormel Foods Corporation (NYSE: HRL) surprised investors with stronger-than-expected first-quarter earnings. Sales during the period were boosted by healthy demand for the company's recession-friendly canned ham-like product, Spam. Today, it seems that Standard & Poor's is revealing its own soft spot for potted meat, announcing that HRL will join its storied S&P 500 Index as of the close of trading on March 3.

Hormel will replace American Capital Ltd. (NASDAQ: ACAS) in the closely watched broad-market index. The latter stock has given up nearly 96% of its value during the past year, and it's extending those losses today with a plunge of more than 16%.

With the end of the year fast approaching, it's time to start putting together "best of" and "worst of" lists for 2008. This entry is a little bit of both, but it's admittedly heavy on the "worst of." Among the current members of the S&P 500 Index (SPX), just 11 were sitting on a year-to-date gain as of the close of trading on Monday, November 24. Since Big Lots (NYSE: BIG) is unchanged, that means we have a whopping 488 securities sitting on a loss for the year.

Let's start with the bad news first. Among the worst-performing stocks on the SPX, the six top spots are claimed by stocks in the Insurance and Real Estate sectors. General Growth Properties (NYSE: GGP) has the dubious honor of dropping nearly 98% on the year, and -- not surprisingly -- American International Group (NYSE: AIG) isn't far behind.