Barnes & Noble downgraded at Jefferies: Jefferies said it was downgrading BKS from Buy to Hold on valuation. Target raised by $3 to $47. Barnes and Noble estimates raised at Goldman: Goldman said it is raising its 2006 EPS estimates on BKS to $2.35 from $2.22 following positive quarterly results. Maintained Underperform rating. CenterPoint Energy downgraded at Prudential: Prudential said it is downgrading CNP to an Underweight rating as issues such as rates and taxes will result in underperformance. Leap Wireless upgraded at Merrill: Merrill said is increasing its rating on LEAP to Neutral from Sell. Strong outlook on growth. Mercury Interactive upgraded at Piper: Piper said it is upgrading MERQ to an Outperform rating as fundamentals are intact and issues such as executive departures and SEC investigation don't have much impact on core business. Myriad Genetics rated new Buy at UBS: UBS said it is reinstating MYGN with a Buy rating. Cites core diagnostics business is driving expansion. Sets $35 target price. PMC-Sierra target raised at Merrill: Merrill said it is increasing its target on PMCS to $15 a share from $11.50 a share. Not looking for many surprises in the near-term. Maintained Buy rating. Synagro Technologies downgraded at CIBC: CIBC said it was downgrading SYGR from Sector Performer to Sector Outperformer and lowered the target by 50-cents to $5 on increased costs and project delays. Tribune downgraded at Deutsche Bank: Deutsche Bank said it was downgrading TRB from Hold to Sell and lowered the target by $2 to $26 following February sales results. Verizon upgraded at SG Cowen: SG Cowen said it is upgrading VZ to Outperform from Neutral. Sees 20+ percent outperformance potential relative to the market over next 12 months. Waste Management added to Focus List at JP Morgan: WMI was added to the Focus List, JP Morgan said. Industry contacts and macro outlook point to a strong results through 2007. Overweight rating and $42 price target.