One way is to use a DVD Recorder such as the GO VIDEO VR4940 which will accept video in either regular RCA / SVIDEO / FIREWIRE and do a direct burn to disc. At the end of the burn you just have to finalize the disc (takes a minute or two). Can't get much better than that!
Alternatively you can get one of those ADS Instand DVD products to plug into your PC/Laptop as that has real-time hardware MPEG encoding and it can do a direct burn-to-disc also.
I've got a pansonic DMR T3040 which has a built in Hard drive that you can also record to and if you need to dupe you copy the Video recorded live to DVD's afterward. Have a VT2 that I use at one place and just hook up the DVD recorder to it, and when I'm done. I just finalize the DVD and give the customer the video. Works GREAT for weddings, if you can get camera men/women, and radios to communicate. Brides and families like to get the wedding video 5-10 minutes after the wedding is done. I don't have to spend hours editing either.
They're certainly one way to do it if you don't mind the generic menus and backgrounds. I believe there is a way on the Philips units to load a new background from a DVD. But you'd need to get that out of Philips somehow.
I'm wondering if this is easier to do with any of the HD DVD recorders. I was told by one of the manufacturers that they saw no need to have such a feature as it'd just confuse Joe Average.