Happily the archives go back to May 2008 so I decided to sift through them all. Of course most of the stuff on there is already well known and it seems that most of the obscure stuff has already been covered in these forums too (and most of the rest is just shit) but there were a few that I can't find mentioned before that seem really promising:
1) BomberBomber Gaiden and BomberBomber Gaiden 2:
Really cool Parodius versions of Darius Gaiden from 2008

Homepage http://www2010.chin3.net/
2) Naginata Destruction:
Hectic lock-on laser single stage score attack

Homepage http://function.ifdef.jp/game01/index.html
3) Hector39 and Storm Gear:
These are both very basic vanilla STG with shot, bomb, focus and little else.
Hector39 from the makers of Rosen Diadem. Play as Hatsune Miku with Nico Nico characters for enemies.Really solid shooter. Input konami code using keyboard for 99 bombs.F2 to change Miku's voice.

Homepage http://www.15citron.com/ichigo/hector39/
Storm Gear from the makers of forthcoming Storm Assault and also available in Flash. Frequent updates (current version v1.17). No high score save as yet. Soundtrack from the makers of Star Shooter Maximum.

Homepage http://www7a.biglobe.ne.jp/~bp-827z/asd ... torm_gear/
4) Volca:
Simulation (not emulation!) of an MSX game from 2010. Retro to the max!

Homepage http://www.alles.or.jp/~gyonin/game.htm
and saving the best till last
5) Tilto's Games - Astral Arms, Dimension Diver and Evil's Enlightenment:
Abstract shmups with nice sound effects and good scoring systems. Astral Arms and Dimension Diver are a lot of fun but Evil's Enlightenment is a fucking masterpiece!!
Astral Arms has a rank based scoring system with lots and lots of weapon choices and a "nowait" (no slowdown) option

Dimension Diver has chain-based stage clearing system with choice of ship speeds and a 30 stage trial option

Evil's Enlightenment has fantastic scoring system. Sacrifice a life to enter Counterattack phase, increase score multiplier by collecting items with bomb and counterattack, as multiplier drains to zero it fills item score gauge increasing base value of items. Other Side mode with faster ship and different shots, Victimise mode with permanent counterattack (like hyper mode). Yes a fucking masterpiece!!

Tilto's Vector page: http://www.vector.co.jp/vpack/browse/pe ... 45804.html
6) Shiroino:
Discontinued abstract shmup from the end of 2010. It looks fantastic- single stage score attack only but there's a choice of stages
Homepage http://nanpuru.soudesune.net/shiroino/shiroino.html
Honestly it's like Indiana Jones in here
