ESXi syslog collector and dump collector
both of these components can be installed on a windows vcenter server from the vcenter install media. they come natively on the VCSA (vcenter server appliance).
of course, it’s necessary to point the ESXi hosts to these new collector locations.
details below:
http://blogs.vmware.com/vsphere/2011/07/setting-up-the-esxi-syslog-collector.html
http://blogs.vmware.com/vsphere/2011/07/setting-up-the-esxi-50-dump-collector.html
update 9/27/2013:
quick commands to set the syslog collector…
esxcli system syslog config set –loghost=<ip address>
esxcli system syslog reload