Mid Side processing is a useful tool for widening stereo fields, frequency dependent processing - such as mono processing the bass frequencies while affecting the width of higher frequencies.
The new MSW2 is a complete overhaul in terms of code, interface & creativity, and can be used both subtly for better mixes, or pushed to the extreme to achieve a host of creative possibilities in the stereo field.
SoundSpot's MSW1 was a popular plug-n for just that, now they've released MSW2 which has the following features:
Available now at £39.95 - a saving of £10.01 (was £49.95) via PluginBoutique.com
With the Boss RC-505 MKII
Older Music Machines & the People Who Still Use Them
New ambient algorithmic reverberator
New PCM 80/81 Editing via the Electra One MIDI Controller