If you like the work of Noiji Ito (Shakugan no Shana, Nanatsuiro Drops etc) then you will want to see Ito-sans ero work in this game Alice Parade (ALICEぱれーど) out in October - some screenshots on the official HP.
Interesting to see that Ito Noiji is using the name "Ito Zatsuon" (伊東雑音) for eroge illustrations.
All these games can be purchased at the Asobit game store in Chuou Dori Akihabara.
Those who cant get to Akihabara can have a look on J-List or through Amazon by using the Top selling 150 eroge ranking chart.
If you are interested in playing with eroge, Mac users can install Parallels - make sure DirectX is enabled on the virtual machine before booting up the image.
Windows users (Parallels users will have to do this too) should go into Regional Settings in the control panel to enable Japanese language display. Once that is done, you should have the option to add the Japanese input method.