Hey there. I guess it depends what you're training for. Do you have a heart rate monitor? It really helps with being bored In hopes of racing this up comming summer sucessfully in the 1/2 catogory, my trainer workouts go like this...

TT: 5x6 minutes at HR 170-175 with two minute recovery and in same work out 5x30 seconds in biggest gear with 1.5 minute recovery. 10 minute warm up and 10 min. cool down as well : )
Crit: 1 min on 10 sec off at HR's 160, 165, 170, 175, 180, 185, 190, 195 (or up to your max) (repeat pattern three times) 5x20 sec full out sprints with 20 seconds recovery. Warmup and cool down too
Long rides- Mine are usually about three hours. 20 minutes on, 10 minutes off really seems to break up the hours. As do old tour videos
Then I try to do "climbing days" simulating short steep hills and long mountains the best I can. Usually, I ride three very very hard days in a row of a combination of the above workouts followed by a complete rest day with that pattern continuing for two weeks-ish (enough for four cycles) and then a four day off period to completely recovery cause I usually feel very bad by then. Eh, I just wanted to post this to give you some more ideas for the every fun trainer. Keep in mind I tend to make things overly complicated =)