VMware Labs recently released version 1.0 of the vCenter Mobile Access (vCMA) appliance. The virtual appliance is based on CentOS 5.2 Linux.
To install, you will simply download the appliance (~300MB) and import via vCenter. Once you import the appliance, the appliance will pick up an IP address via DHCP and start a management console on port 5480. Browse to https://IPADDRESS:5480 and log in with the default user/pass of root/vmware. If you are not using DHCP on your network, open up the console of the appliance and set the IP address there.
Once configured, access the the appliance via https://IPADDRESS/vim. From here, you can log in to your vCenter server via a valid user name and password and begin to manage your environment from your iPad or mobile device!
You can read more about the vCMA and download the appliance here.