When I finished the beastly challenge, I was burned out pretty badly. A few lazy days and a few extra skipped days due to a new girlfriend put me in a pretty bad spot with over 2000 reviews to learn. I've overcome deficits like that a couple times, though it's not easy. However, I've been having a really hard time overcoming this one - for a while I've been getting almost as many new reviews a day as I can work off, not to mention the old stuff. Part of the problem is due to missing days due to family stuff, but I think an equally big issue is that I've got a ton of stuff that was added during the challenge that I still haven't mastered.
The big problem with this is that the trouble words are still too spread-out for me to pound them into my head through Skritter. I know there are other options for learning this material, such as making my own flashcards and pounding them a bit extra on the side, but I wonder if there might not be a way to improve Skritter's SRS algorithm to deal with situations like this so that I could get this stuff into my memory and work my review queue back down to more encouraging levels.
On a last note, you guys might want to change the wording on the Professor's response to the word "family" - "Sorry, we don't have family plans" sounds like a rather personal piece of information, though I did figure it out eventually. :D