with much better results than bicubic.
A program that may or may not be useful to those in the business...
tom c
http://www.shortcut.nl/products.php?parentid=3&count=7

As well as S-pline, there are some other products listed in these links, as well as user opinion and visual results:

http://members.ozemail.com.au/~binaryfx/PSTV_links.html#R

Resolution and inventing pixels are two topics which are always being talked about on various graphics lists.

Take all vendor claims with a grain of salt and test with your common images, workflow and output before making any firm decisions or purchases.

Regards,

Stephen Marsh.