@johnpowell while its true that an SDK is forthcoming, we have no idea what kind of restrictions Apple may continue to impose on applications and how they will allow these applications to be deployed. They could very well be highly restrictive and thus only allow Apple censored applications to be “officially” installed.
I believe that it is very difficult to irreparably damage a piece of hardware like this by jailbreaking it since it isn’t making any changes that will prevent normal operations (read: filesystem or other system I/O) to occur. Interestingly it is installed by using an exploit in the way Safari handles TIFF files. Once it has installed it actually patches this vulnerability so in a way you’d be making your touch more secure.
I understand not wanting to do it. I got a touch after playing with one that my friend bought. His was jailbroken but I waited about a week and spent some time reading about it before I made my choice to do it.