Scott Linebrink was the big MR for 08 and got 4/19 from the White Sox. He hasn't pitched over 60 innings yet and has had an ERA over 4.50 the past 2 years.
David Riske the other big MR signing that year for 3/13 had a 3.00 ERA over 5 years and has had a 5.40 ERA for the Brewers since his contract.
In 09, K-rod got 3/37. Was pretty pitiful for that money in his first year and was good in his second, albeit in less than 60 innings. He still has 12+ mil due to him next season
In 09 again, Damaso Marte, got 3/12, and has pitched a whopping 30 innings for the Yankees to the tune of a 6.40 ERA.
Those are the 4 guys who have gotten contracts over 2 years as MR over the past couple years with Brandon Lyon being done with one year of his from 10'. None of them have really worked out so far, and at the going rate of 3/15 for questionable MR, I'd probably pass or sign maybe one. Two MR at 3/15? no thanks