ISI Web of Knowledge just added new search filters in the Web of Science databases:

Funding Agency
A query for a funding agency will search the Funding Acknowledgment section within a record.
Search examples:
Full name of granting agency: National Institutes of Health
OR
Abbreviated name of granting agency: NIH

Grant Number
A query for a grant number will search the Funding Acknowledgment section within a record.
Search examples:
RO1 DA019107
RO1 DA-019107