Running for a few months now, is a bus service which takes you from the convenient SM Mall to various locations, including Clark Airport, Manila, Manila Airport, and Subic Bay. Here are the boards displayed outside the Mall. First the Clark - Subic Service.
The feedback I have heard has generally been favorable, but please do leave your comments, if you have used the service. Particularly useful are the services in the very early morning hours, saving you from having to stay overnight in Manila if you have an early flight, whilst also allowing you to travel while the traffic is light.