Been listening to a lot of the newer songs lately, and since this is like, a month-old bump, I'll try to pack in a lot of 'em:
Cloud Rider by Hayato Tanaka (IA)
Death Should not Have Taken Thee (Shinde Shimau to wa Nasakenai) by Jesus-P (Rin and Len Kagamine)
Dragon Rising by takamatt (GUMI and Len Kagamine)
Junjou Skirt by 40m-P (Miku)
Clean Freak (keppekishou) by scop (GUMI)
Remains of Love (Koi Nokoritsuki) by Taruto (GUMI)
(One of my personal favorites) A Town Nearing Spring (Haru ni Ichiban Chikai Machi) by 40m-P (GUMI)
I'm a Kunoichi but I want to Love! (Kunoichi Demo Koi ga Shitai) by MikotoP (Miku)
Brain-Fluid Explosion Girl (Noushou Sakuretsu Garu) by Reruriri (Miku and GUMI)
Reload Words by sat (Kaito) [English]
(A really under-appreciated song) Propaganda by Karasuyasabou (Rin Kagamine)
Singason (Sing a Song) by Rerulili, baker, otetsu, LiveP, owataP, Gaku, nagomi, nakyamurya, kihei and kagomeP (Various)
Phew. That's all of it.