In an effort to make life simpler I have compiled a short list of useful link to build numbers and patching sites for SharePoint 2010 and SQL 2008 R2.

The Microsoft SharePoint Updates PagesSharePoint 2010 – http://technet.microsoft.com/en-us/sharepoint/ff800847.aspx
SharePoint 2007- http://technet.microsoft.com/en-us/office/sharepointserver/bb735839.aspx
This is your official sites for downloading the SharePoint updates from Microsoft.  Highly useful rather than waiting on the blogger community to send you a link, or get the TechNet bulletin, your carrier pigeon to arrive, or any of the other 120+ ways to get your SharePoint update information!

Cornelius J. van Dyk’s Blog on Versions for SharePoint
http://www.cjvandyk.com/blog/Lists/Versions/
Highly useful link if you find yourself a CU or two behind and you want to know what version of the CU is currently applied to your farm.  Simply visit your Central Admin Manage Patch Status page http://localhost:####/_admin/PatchStatus.aspx to check what version number your farm is on.

SQL 2008 R2 build numbers
http://support.microsoft.com/kb/981356/This has proven to be the most reliable site I have found for listing the latest build numbers for SQL Server since 2008 R2 dropped.  To find out what what build you are running do the following:

1. Open SQL Management Studio
2. New Query
3. type and then execute the following command

   select @@version 

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   {color:#0000ff;}
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   {color:#006080;}
   .externalclassaf644619e5194a77b8e785ba7f262756 .csharpcode .op
   {color:#0000c0;}
   .externalclassaf644619e5194a77b8e785ba7f262756 .csharpcode .preproc
   {color:#cc6633;}
   .externalclassaf644619e5194a77b8e785ba7f262756 .csharpcode .asp
   {background-color:#ffff00;}
   .externalclassaf644619e5194a77b8e785ba7f262756 .csharpcode .html
   {color:#800000;}
   .externalclassaf644619e5194a77b8e785ba7f262756 .csharpcode .attr
   {color:#ff0000;}
   .externalclassaf644619e5194a77b8e785ba7f262756 .csharpcode .alt
   {background-color:#f4f4f4;width:100%;margin:0em;}
   .externalclassaf644619e5194a77b8e785ba7f262756 .csharpcode .lnum
   {color:#606060;}

We are working on getting a SQL Server version’s page up on CvD’s blog as well, but for now I here is a table with the info: