http://jstuff.wordpress.com/jbridge/

jBridge is an application designed for bridging VST plugins (up to the 2.4 VST specification).

Using inter-process communication mechanisms, it aims to make it possible to run 32bit plugins in 64bit hosts, 64bit plugins in 32bit hosts, or even bridging 32bit plugins to 32bit hosts, allowing to overcome the memory limitations of a single 32bit process, in this last case. A demo version is available here (v1.19) and here (v1.2) – Scroll down for more details and alternate links.

This software works on Windows XP/Vista/7 only – To make use of all its features, a 64bit Windows OS such as Vista or 7 is recommended.