Nintendo DS-TT Card for DS Lite
Nintendo DSTT is a very popular card compatible with SDHC cards.
The most common problem with a legit DSTT card is the infamous "Menu?" screen, much like the dreaded R4 "Loading" screen, which is usually a software issue and can be easily fixed by installing the software from the DSTT website onto your micro SD card. Although the OS (menu) files must be present in the root of the SD card, the software is intelligent in that the ROMs may be placed anywhere on the flash card will still be found. The DSTT also exists in a version compatible with the recently released Nintendo DSi which is called the DSTTi.
The DSTT and DSTTi are versatile beyond simply playing homebrew and ROM software though, one of the most useful features being that they incorporate cheat support in a variety of games.
The DSTTi has been tested and reported to work with the DSi XL console released in March 2010.