If you have Windows Vista or XP you can download gadgets, so I downloaded a countdown clock that tells me every time I turn on my computer, exactly how many days, mins, and secs I have left till 90 days. It really helps me think that I'm accomplishing as I see the mins tick down. Here is the link. I'm up to 43 days and that's my longest streak...
P.S. One thing to keep in mind is that it gives 30 days for every single month so you might have to play around with it a bit and not put in the correct day for your end time, but rather a couple of days before as your end time.
I'm really thankful for you sharing that countdown clock with us, it is a much needed and helpful tool that I really think will help a lot... On the other hand, I also think that we need to stay focused on each day individually. (Just my two cents).