The one you are talking about for CF cards is called TxtWriter, right? I believe that the sources were modified to include DLDI support, so theoretically all cards should be supported now. In one of the DS dev sections of http://forum.gbadev.org you will find a topic called "DLDI for old or unsupported homebrew" that has a download link for the new version. Be sure to patch it with the DLDI patch for your device.
You could also use Vi, part of DSLinux. It's somewhat difficult to navigate, as it's driven by keyboard commands, but it works well enough for short tasks.
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