requesting a change on package group to "Styles", for D7 version. it's a fair alternative to ImageCache.
package = Styles
in module .info file
File Styles 7.x-2.x-dev
Styles UI 7.x-2.x-dev
all 3 deal modules deal with Image Styles in D7, except Styles/Styles UI also deals with any kinds of files, and File Styles adds formatters/settings to Fields/Content/CCK, requiring also Styles module.
an alternative would be ImageAPI:
ImageAPI GD2 7.x-1.x-dev
ImageAPI ImageMagick 7.x-1.x-dev
or Image Styles, but this one is redundant with Styles around.