It is difficult to ride indoors, no doubt about it. Other than your objective for the day, give the space where your trainer sets some personality other than your trainer. Can you hang some great photos, perhaps some sort of momento of an upcoming goal that you have this season... race, tour etc... I know this may sound crazy, but make the space inviting and about something other than the trainer. Are you doing trainer DVD'S, can you watch cycling/races or DVD"S? Sometimes having something to look at while riding takes just a bit of attention away from what you are doing at the moment. Could you join a trainer group or invite friends over to ride as well?

Lastly, remember to have a fan in the room; we sometimes tend to forget that outside we have air passing by us... inside we need the same thing... still need to cool our body down.

Sounds like you are on the right track... keep going!