Insert item before each element of a list

[mooremathewl at gmail.com]

What's the best way to accomplish this?  Am I over-complicating it?  My gut feeling is there is a better way than the following:

>>> import itertools
>>> x = [1, 2, 3]
>>> y = list(itertools.chain.from_iterable(('insertme', x[i]) for i in range(len(x))))
>>> y
['insertme', 1, 'insertme', 2, 'insertme', 3]

I appreciate any and all feedback.

--Matt