The rate went to standard rate (.00330) and the residuals dropped for may.The MB Finance rates are normally posted at www.mbworld.org in the leasing and financing section. Here are the April rates (no May rates posted yet).
2008 Mercedes CLS550 Sedan
24 Month - Residual 64% of MSRP - .00200 Base Rate
36 Month - Residual 54% of MSRP - .00135 Base Rate
48 Month - Residual 47% of MSRP - .00135 Base Rate
60 Month - Residual 42% of MSRP - .00320 Base Rate
Looks like the money factor is pretty cheap