WSS3.0 Service Pack 3 and MOSS2007 Service Pack 3 has been released.

For WSS 3.0 Service Pack 3:
http://support.microsoft.com/kb/2526305

For MOSS2007 Service Pack 3:
http://support.microsoft.com/kb/2526299

Installation Order:

Install WSS Service Pack 3
Install MOSS Service Pack 3

Install needed Language service packs:
Install Service Pack 3 for Windows SharePoint Services 3.0 Turkish
Install Service Pack 3 for Windows SharePoint Services 3.0 Arabic

After applying the preceding updates, run the SharePoint Products and Technologies Configuration Wizard or “psconfig –cmd upgrade –inplace b2b -wait” in command line. This needs to be done on every server in the farm with SharePoint installed.

Important! . As you know at same time october CU 2011 has already released. There is some problems upgrade both SP3 and October CU 2011. Microsoft has working on it. So your options now install sp3 or install october CU. Not upgrade together. I will inform you when it is fixed.