My own theory about where the Cm7sus comes from:

Capo third, picking a C shape. This moves to an amputated G shape which I'd pick on the middle four strings:

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| | | | | | |
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| |o| | | | |
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| | | | |o| |
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From there down to what certainly is an Am7 shape:

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| | | | |o| |
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| | |o| | | |
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| | | | | | |
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In passing back to the G shape, if you're playing the same riff as Paul S then you will fret the D on the off beat:

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| | | | |o| |
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| | |o| | | |
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| | | | |o| |
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In that it started out as a minor seventh and had the extra note tacked on it's fair enough to tack the 'sus' onto what the chord started out as. If you have to give the beast a name at all that is, which I guess is the real problem here.

Vague attempt at tab of the same:

|-----0--------------------------
|---1-----3-------1-3---0--------
|-----0---------0-----------0----
|-------------0-------2-------0--
|-3-------2-------0--------------
|-------------------------3------

-mike-