I see one approval of 03/22/02 as mentioned below:
I-140 : RD - February 19, 2002
ND- March 22, 2002
AD- July 5, 2002.
This is the latest approval, I have come accross. Probably, the INS is processing petitions of Last week of March'02. They are moving deadslow.
Petitions filed in April'02 may expect something from INS in Aug'02.