There is a Free software NTSC scaler which produces quite nice results: http://www.slack.net/~ant/libs/ntsc.html
Also suggested by Cesco on MRC (with some other comments): http://www.msx.org/forumtopicl7434.html
totally second this request, the "TV" scale algorithm does not look very accurate to me...
just tried the new "RGBTriplet" scale_algorithm, it looks better :)
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