I know that cold weather is coming up for some of us. In order to keep up my training I bought a set of rollers. I recommend them to anyone that does not want to loose conditioning. They are a little tough to get used to but in about 2 hours of practice you should be riding like a pro. A standard set with no additional resistance contraptions will do fine, I've found that the ride is very much like actually riding and my average speed did not vary too much from my on-road numbers.
The rollers are a little more fun because they require that you work on balance and cadence to keep a smooth line. Further, most trainers to me seem like stationary bikes and not real riding. There is no coasting with rollers either, if you need to stop, have someting to grab....quick.
The set I got has two aluminum rollers to support the rear wheel and a single aluminum roller for the front. The front roller on the rear is connected to the roller at the front tire with a rubber "belt". There is a additional magnetic resistance unit but its really not needed.
I just thought someone might be interested.