Upgrading from:

Algebra`Horner`

New function HornerForm has been added to the built-in Mathematica kernel.

HornerForm puts polynomials into Horner form using Horner's rule to rearrange the polynomials:

Version 5.2 << Algebra`Horner`;
Horner[11 x^3 - 4 x^2 + 7 x + 2]