Already 35 downloads and no bug report? Nice!
Update:
*Change lanczos4resize to spline16resize to limit halos artifacts
*Add 'hq' mode using nnedi2 upscaling. Particulary usefull for low resolution sources, specialy on animes:
[img=http://img187.imageshack.us/img187/893/00000j.th.jpg]
Here it is: