Blender 2.5 Python 3.2 Selecting Creased Edges

import bpy

obj = bpy.context.active_object
bpy.ops.object.mode_set(mode='OBJECT')

for i in obj.data.edges: 
    if i.crease > 0.0:
        i.select = True    

bpy.ops.object.mode_set(mode='EDIT')

This is useful if for whatever reason you need to select all creased edges on an object that has a lot of geometry.

As a response to Enzymes query below, I posted additional examples of edge selection, which I think can prove to be useful to get people started Edge selection with criteria