Additional information about the American Recovery and Reinvestment Act (ARRA aka Stimulus Package) is available on the following websites:

RECOVERY.GOV
Core Communication Website re: ARRA from Obama Administration
http://www.recovery.gov

Individual agencies and institutes are creating their own Recovery.gov websites.  A list of such websites can be found at http://www.recovery.gov/?q=content/agencies

FEDERAL AGENCIES
Resources and communications related to the ARRA are posted by agency, listed by date, with the most recent appearing on top.

NIH Key Source Regarding Stimulus (ARRA) and Specific Funding Opportunities
http://grants.nih.gov/recovery/

NIH Director's ARRA Update
http://www.nih.gov/about/director/newsletter/newsletter.htm

From the Director: NIH's Role in the American Recovery and Reinvestment Act (ARRA)
http://www.nih.gov/about/director/02252009statement_arra.htm

NIH - Specific Agencies

NIAID - How the NIAID Will Use the Stimulus Money
http://www.niaid.nih.gov/ncn/recovery/niaid.htm, posted - 03.13.2009

NSF

COGR: NSF ARRA Terms & MRI-R^2 & ARI-R^2 Announcements, posted - 05.12.2009

NSF Describes Key Elements of Its Planned Use of Stimulus/ARRA Funds, posted 03.18.2009

National Science Board to Discuss Spending and Oversight of NSF's $3 Billion Stimulus to Invest in America's Scientific Enterprise
http://www.nsf.gov/news/news_summ.jsp?cntn_id=114211&govDel=USNSF_51

COGR: NSF Plans for Stimulus Spending

DOE

Secretary Chu Announces Nearly $800 Million from Recovery Act to Accelerate Biofuels Research and Commercialization, posted 05.06.2009.

Energy Secretary Chu Announces $1.2 Billion in Recovery Act Funding for Science, posted - 03.23.2009

ASSOCIATIONS

AAAS
Table. R&D and Other S&T Funding in FY 2009 Economic Recovery Act Appropriations
http://www.aaas.org/spp/rd/stim09c.htm#tb

AAU
Comparison of Higher Education and Research Provisions in House, Senate, and Final Economic Recovery Bills H.R.1
http://www.aau.edu/budget/economic_recovery_legislation.aspx?id=8198

STATE AGENCIES

New York State Official Web-site re: Implications of ARRA
http://economicrecovery.ny.gov 

OTHER

Federal Demonstration Project (FDP) - posted 08.24.2009
The Federal Demonstration Project (FDP) formed a special FDP ARRA subcommittee, with the purpose of disseminating information about reporting obligations and effective management approaches for ARRA funding among research universities and organizations involved with FDP.  As a result, the subcommittee developed a preliminary website, which will be updated on a continual basis:
http://thefdp.org/ARRA%20Award%20Management%20and%20Reporting.html
In addition, FDP/COGR have created preliminary ARRA FAQs:
http://www.cogr.edu/docs/F&AAARADocument.htm

White House Office of Management and Budget
http://www.whitehouse.gov/omb/assets/memoranda_fy2009/m09-10.pdf