This homebrew games don't invalidate the warranty or modify the system: because they're just web pages.
DSiCade has the option to log in with a Google Account in order to save highscores and show avatars in the ShoutBox.
In order to play, you must access http://www.dsicade.com/ from the Nintendo DSi Browser.
Games available (Update 24/05/2010)Edit
|Touch Mii||War Games||Shout Box|
|Defend Our Home||WackyTapDsi||Hangman|