The following tool should make life a lot easier if you have to patch multiple ESX servers. (Though I havn't tried it myself yet)
http://www.mightycare.de/index.php?option=com_docman&task=cat_view&gid=16&Itemid=69
Also there is ViDocIT if you want to produce a basic report on your VI3 server install - you will need Virtual Center though and the demo only supports a one server report.
Website:
http://www.vidocit.com/
viDocIT is a simple to use Windows application that in a matter of minutes will create an installation documentation report for each of your ESX (v3.0 or later) hosts connected to VMware VirtualCenter v2.0 or later.
Each ESX host is represented by it´s own html file and have the following information:
* Host Summary
* Processor configuration
* Physical RAM
* Storage - SAN, Fc, iSCSI, NFs and multipathing
* Datastore information
* Network - Virtual switches, physical adapters.
* Licensing configuration
* Console Operating System information
See a sample doc:
http://www.vidocit.com/html/sample/esxdoc-sample-01.html