Comiket is a great biannual event since so much new fan-made content is created. A release I really enjoyed this time around, is the album, Haruhigurashi by @RYOUKI & ABSOLUTE CASTAWAY. It's basically a cover album of the Higurashi no Naku Koro Ni anime OP and ED, the Suzumiya Haruhi no Yuutsu OP and ED, and the 3 songs from the album released on the day Live Alive aired. (God knows..., Lost My Music, and Koi no Mikuru Densetsu.
My favorites are the Lost My Music cover and Koi no "Nagato" Densetsu. The LMM cover sounds very much like a live performance and has extra spunk to it compared to the original. Koi no Nagato Densetsu is a very nice parody since the two vocals are very close to Haruhi's and Yuki's. I really like this song because the electric guitar is much heavier and the imitation Haruhi voice is so freakin' awesome.

Here are some adorable scans:

This album is definitely a keeper, and the mini Haruhi and Rena are too freakin' cute. Some good songs to comfort me since I am incredibly sick now. Hurray for Winter.