Yesterday (November 19th) VMware released vSphere 4 Update 1 for ESX and vCenter:
<ul>
	<li><a href="http://www.vmware.com/support/vsphere4/doc/vsp_esx40_u1_rel_notes.html">VMware ESX 4/4i Update 1</a>
<ul>
	<li>Required for View v4</li>
	<li>Official Win7 and WS08r2 Support</li>
</ul>
</li>
	<li><a href="http://www.vmware.com/support/vsphere4/doc/vsp_vc40_u1_rel_notes.html">VMware vCenter 4 Update 1</a>
<ul>
	<li>Required for View4</li>
	<li>More DB2 support</li>
</ul>
</li>
</ul>
Click the links above to view the release notes for each product.

The Update 1 release notes for ESX and vCenter each contain 38 bux fixes.  These are in addition to those contained in the three previous patch bundles for ESX 4. The VMtools installed inside each guest OS will need to be upgraded after installing ESX 4 Update 1.