ID3 vTOPE NPRTCOM TALB All Things ConsideredTIT2 1 Joining with Gates, Buffett Targets World's IllsTCOP 2006TRCK 10TCON BusinessCOMM nprComment Warren Buffett's pledge of $31 billion to the Bill and Melinda Gates Foundation has been long in the making, according to friends of the astute investor from Nebraska. Fortune magazine's Carol J. Loomis says Buffett told her months ago about his plan.TPE1 NPRTYER 2006 P , @ƞW?;JD_]!{>B|]?'+h_!Ixw˟pnL- ?Y