The package delivery company is doing a good job in difficult end markets.UPS (UPS -0.01%) stock is attracting a lot of attention from value investors, and rightly so. The stock's 4.5% dividend yield will please income-seeking investors, and the company has plenty of recovery potential as the economy, hopefully, improves and capacity gets taken out of the parcel delivery sector. There's a lot to like about UPS, but is it time to pull the trigger and buy the stock as it trades around the $137 mark? Here's th ...