One was a crossover with X-Factor, I believe, with Blaine as one of the judges and Kurt as a contestant. This one was a future!fic, as they already knew each other, and had dated as in canon, but had grown apart. Some co-workers of Kurt's sent in his application to the show, without his knowledge, and without actually knowing if he could sing, IIRC. It was multiple chapters, but still a WIP, I think, although that might have changed since I last read it.
The other story was a crossover with the new show, The Voice. Again, Blaine was a judge and Kurt was a contestant, but I'm pretty sure it was an AU and they hadn't met before. Again, WIP and I think it was only 1 chapter so far. This one was quite recent.
I'm ninety percent positive I read both on LJ.
Help, my google-fu has totally failed me.
Mods, I hope my tags are ok.