MOST NOTEWORTHY: Assured Guaranty, Limelight Networks and Monotype Imaging were today's noteworthy initiations:

• UBS expects Assured Guaranty (NYSE: AGO) to increase shares in the public finance guaranty market and take advantage of reinsurance opportunities. Shares were initiated with a Buy rating and $31 target.
  
• Merriman assumed Limelight Networks (NASDAQ: LLNW) with a Neutral rating. The firm believes investors should remain cautious until a ruling in the company's patent infringement trial is handed down.
  
• Monotype Imaging (NASDAQ: TYPE) was initiated at Banc of America with a Buy rating and $16 target. The firm highlighted the company's strong revenue visibility and attractive valuation. Shares were also initiated at JP Morgan with an Overweight rating, citing TYPE's discounted valuation and solid IP licensing franchise.

OTHER INITIATIONS:

• B. Riley assumed National Penn Bancshares (NASDAQ: NPBC) with a Neutral rating and $16 target.
  
• Vestas Wind Systems (OTC: VWSYF) was initiated at Jefferies with a Hold rating.
  
• UBS started MBIA Inc (NYSE: MBI) with a Neutral rating and $6 target.
  
• Morgan Joseph initiated DXP Enterprises (NASDAQ: DXPE) with a Buy rating and $53 target.

"Alternatives may not be an important source of electricity, but they are the fastest-growing subsector in the energy space," says energy sector expert Elliott Gue in Personal Finance. Here, he looks at wind power.

"The US Energy Information Administration (EIA) projects that wind power will grow by more than 7%, encouraged by generous government subsidies. Compare that to just 1.5% annualized projected growth in total electricity demand.

"The world's largest wind turbine producer, Vestas Wind Systems (OTC: VWSYF), fell on hard times back in 2005. It priced some of its turbines too aggressively and saw a surge in warranty claims because of defective components.

"But the stock appears back on track. Warranty provisions are down to 5% of revenues. Profit margins surged 4 percentage points year-over-year because of more rational turbine pricing. Vestas' current backlog stands at EUR4.1 billion (US $6.03 billion), up more than 30% year-over-year.