Get XM Radio Online free for 3 days

XM has a free 3 day trial for trying out their service on your PC (no Mac support, it appears), XM Radio Online.
Seems like a good idea; we have XM and love it, they should let all current subscribers use this for free to 30 days,
they'd sell a lot more net and sat set ups.

We're trying this out now and trying to figure out if we can fool it so we get another 3 days, and another 3 days... oh wait, that was our "inside voice".