If you are interested in finding about Federal grants as soon as they are announced, go to this site and you will receive daily notification of all new Federal grant opportunities.  Subscribe at:

 http://www.grants.gov/search/subscribeAll.do

If you only want to find out about specific types of grants, go to this site and check areas of interest:

http://www.grants.gov/search/subscribeAdvanced.do

You might also want to have them send you updates or critical tips from this site:

http://www.grants.gov/applicants/email_subscription_signup.jsp

Or you can use this application to get both announcements and updates without cluttering your email:

http://www.grants.gov/help/rss.jsp

By the way if you haven’t checked out grants.gov, you should!!!  Grants.gov is a central storehouse for information on over 1,000 grant programs and provides access to approximately $500 billion in annual awards.  Grants.gov is a source to FIND and APPLY for federal grants. The U.S. Department of Health and Human Services is the managing partner for Grants.gov, an initiative that is having an unparalleled impact on the grant community. Learn more about Grants.gov and determine if you are eligible for grant opportunities offered on this site.