MOST NOTEWORTHY: Limelight Networks, Diebold and Charles & Colvard were today's noteworthy upgrades:

• Jefferies upgraded shares of Limelight Networks (NASDAQ: LLNW) to Hold from Underperform on valuation and believes it impossible to know what will happen to the company from here. On the downside, Jefferies notes a permanent injunction means the business is nearly worthless, but on the upside, is the possibility of sale to Akamai (NASDAQ: AKAM) or a large telecomm service provider.
• Baird raised Diebold (NYSE: DBD) to Outperform from Neutral citing expectations of a higher bid from United Technologies (NYSE: UTX).
• Merriman upgraded shares of Charles & Colvard (NASDAQ: CTHR) to Buy from Neutral on valuation, as they believe the current share price does not account for the potential wholesale value of the company's manufactured inventory and method patent. They believe Charles & Colvard is a potential acquisition target.

OTHER UPGRADES:

• Goldman raised Eaton (NYSE: ETN) to Conviction Buy from Neutral and added Royal Caribbean (NYSE: RCL) to its Conviction Buy List.

MOST NOTEWORTHY: Spectra Energy (SEP), ComScore (SCOR) and Data Domain (DDUP) were today's noteworthy initiations:

• Spectra Energy (NYSE: SEP) was initiated with a Buy rating and $32.50 target at Citigroup, with an Overweight rating and $32 target at Lehman Brothers and with an Overweight rating at Wachovia. Citigroup believes SEP provides investors above-average distribution growth driven by stable cash flows with little or no direct exposure to commodity prices. Wachovia is positive on SEP given its multi-year growth profile and high quality assets.

• ComScore (NASDAQ: SCOR) was initiated with an Outperform rating and $28 target at FBRC on valuation. The company was also initiated at Jefferies with a Hold rating and $25 target, citing valuation, although the firm believes the company is well positioned to benefit from the market demand for Web traffic data/analytics. Deutsche Bank initiated shares of ComScore with a Buy rating and $28 target.

• Data Domain (NASDAQ: DDUP) was started at Pacific Crest with an Outperform rating and $30 target and the firm expects growth to exceed 50% annually for at least the next two years.

OTHER INITIATIONS:

• ThinkEquity started shares of Altair Nanotechnologies (NASDAQ: ALTI) with a Buy rating and $6 target.

• ThinkEquity transferred coverage of Blue Coat Systems (NASDAQ: BCSI) with a Buy rating and raised its target to $63 from $51.

• Stifel started shares of ICT Group (NASDAQ: ICTG) with a Buy rating and $20 target.

• B. Riley started shares of Charles & Colvard (NASDAQ: CTHR) with a Buy rating and $8 target.

Analyst summaries provided by TheFlyOnTheWall.com (subscription required).