A few days after the scheduled release date, the year end updates are now available for download. These updates may be used for versions 3.72, 3.73, 3.74, 4.00, 4.05, 4.10, 4.20, 4.30, and 4.40 only. As changes become available, these files will be update and available for download through these same links.
As with any system changes, be careful to consider all of the integrated applications, enhancements and customizations your system is running and the impact these updates might have.
Sage ERP MAS 90 and 200 Tax Table Updates and Interim Release Download
The Q1-2011 Tax Table Update (TTU) contains 2011 US Federal tax rates.
You can access the TTU here:The 2010 Q4 Interim Release Download (IRD) contains the Year End program changes for Accounts Payable, Electronic Reporting, and Payroll.
You can access the IRD here:

The 2011 Payroll Tax Tables Update Version 4.40, dated 12/17/10 has been amended as of 12/23/10. The links listed above are directed to the most up-to-date file available.
[...] wrote about this recently with the release of the Tax Table Updates and Interim Release Download but it bears repeating : When considering an update to your system, integrated applications, [...]