Jake Probst, aka anoNL has updated VNDSx, the visual novel reader for DS. v1.4.0 includes some improvements and a couple of bug fixes, see the change log below for more details. The download is just for the reader itself, links to compatible visual novels can be found at Digital Haze
"This version should be much more stable than the last. Random crashes should be mostly gone, and the program is much more tolerant towards corrupted images or buggy scripts. File-access used to be unreasonably slow for very large (100MB+) ZIP-files, up to several seconds. By doing some additional caching, that's no longer problematic. Another important performance improvement is the image preloader that scans ahead in the script and starts loading the next image while you're reading."
Changelog:
bugfixes:
Fixed a memory leak and a wild pointer in png loader.
Prints an error instead of crashing if an image is corrupted.
improvements:
Large parts of the program have been rewritten, it's now much more stable.
Decreased png loading time by 10-25%
ZIP file entries are cached to decrease novel load times.
Scans ahead to preload the next image.
Uses a modified version of libfat to decrease seek-times in large files.