I don't know if he's working still on it, but tHE fISH from
http://www.vdfilters.f2s.com/ has worked on new resizing filters for VirtualDub (I was one of those who bugged must about this ones
)...
Algos like Lanczos, Hermite etc. are available... I have some beta version, don't know if he released any...
If you don't find it on his site, you can drop him a mail and beg him to work on it ;-) .
Cheers...